//-------------------------------------------------------------------------------------------------
//Copyright 2016 David T. Ashley
//-------------------------------------------------------------------------------------------------
//This source code and any program in which it is compiled/used is provided under the GNU GENERAL
//PUBLIC LICENSE, Version 3, full license text below.
//-------------------------------------------------------------------------------------------------
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//  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
//WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
//THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
//GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
//USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
//DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
//PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
//EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
//SUCH DAMAGES.
//
//  17. Interpretation of Sections 15 and 16.
//
//  If the disclaimer of warranty and limitation of liability provided
//above cannot be given local legal effect according to their terms,
//reviewing courts shall apply local law that most closely approximates
//an absolute waiver of all civil liability in connection with the
//Program, unless a warranty or assumption of liability accompanies a
//copy of the Program in return for a fee.
//
//                     END OF TERMS AND CONDITIONS
//
//            How to Apply These Terms to Your New Programs
//
//  If you develop a new program, and you want it to be of the greatest
//possible use to the public, the best way to achieve this is to make it
//free software which everyone can redistribute and change under these terms.
//
//  To do so, attach the following notices to the program.  It is safest
//to attach them to the start of each source file to most effectively
//state the exclusion of warranty; and each file should have at least
//the "copyright" line and a pointer to where the full notice is found.
//
//    <one line to give the program's name and a brief idea of what it does.>
//    Copyright (C) <year>  <name of author>
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//Also add information on how to contact you by electronic and paper mail.
//
//  If the program does terminal interaction, make it output a short
//notice like this when it starts in an interactive mode:
//
//    <program>  Copyright (C) <year>  <name of author>
//    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
//    This is free software, and you are welcome to redistribute it
//    under certain conditions; type `show c' for details.
//
//The hypothetical commands `show w' and `show c' should show the appropriate
//parts of the General Public License.  Of course, your program's commands
//might be different; for a GUI interface, you would use an "about box".
//
//  You should also get your employer (if you work as a programmer) or school,
//if any, to sign a "copyright disclaimer" for the program, if necessary.
//For more information on this, and how to apply and follow the GNU GPL, see
//<http://www.gnu.org/licenses/>.
//
//  The GNU General Public License does not permit incorporating your program
//into proprietary programs.  If your program is a subroutine library, you
//may consider it more useful to permit linking proprietary applications with
//the library.  If this is what you want to do, use the GNU Lesser General
//Public License instead of this License.  But first, please read
//<http://www.gnu.org/philosophy/why-not-lgpl.html>.
//-------------------------------------------------------------------------------------------------
//This program, a PHP script, modifies all filenames in a directory to a canonical
//form (no upper-case letters or unusual characters).  This program is part of a
//3-program suite designed to collectively create a web page directly from
//digital camera files (and of course the web page can be customized by
//hand-editing after it is automatically generated).  The supported process for
//creating a web page involves 3 programs (rather than 1) primarily to circumvent
//the involuntary process termination that will occur in some shared environments
//if a process consumes too much CPU time.
//
//The 3 programs in the 3-program suite are:
//
//   filenames_canonize.php (this program):
//      Converts all names of files in a directory to lower-case, and makes
//      substitutions for any unusual characters.
//
//   thumbnails_make.php:
//      Creates thumbnails from recognized image types.  The thumbnails are
//      named relative to the original image file with the suffix "_small".
//      Only 20 files are converted on each invocation of the program, to
//      avoid the involuntary process termination that typically occurs in
//      a shared hosting environment when a process uses too much CPU time.
//      The program should be run repeatedly until it indicates that it has
//      no more thumbnails to create.
//
//      If any full-sized photos are modified, any corresponding thumbnails 
//      should be deleted and thumbnails_make.php and indexfile_make.php
//      should be run again.
//
//   indexfile_make.php
//      Scans a directory and makes an index file ("index2.php") displaying
//      all the thumbnail images, each of which link to the corresponding
//      full-sized image.  The index file is tailored to Dave Ashley's
//      needs, but the created file can be edited and most of the content
//      pasted into an HTML file.  To avoid the accidental loss of 
//      information, any existing "index2.php" file is renamed out of the
//      way.
//
//This script is designed to be run manually (rather than automatically invoked
//as a result of a web page request).  It was written in PHP for convenience
//simply because DreamHost (the web hosting company Dave Ashley uses) has as part
//of its hosting environment PHP with the ImageMagick library compiled in.
//
//Usually, this script is invoked using "php <path>/filenames_canonize.php", but
//the method of invocation may vary based on computing platform details.
//--------------------------------------------------------------------------------
//This program is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//The GNU General Public License is reproduced below, and also is 
//available at http://www.gnu.org/licenses/.
//--------------------------------------------------------------------------------
//                    GNU GENERAL PUBLIC LICENSE
//                       Version 3, 29 June 2007
//
// Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
// Everyone is permitted to copy and distribute verbatim copies
// of this license document, but changing it is not allowed.
//
//                            Preamble
//
//   The GNU General Public License is a free, copyleft license for
// software and other kinds of works.
//
//   The licenses for most software and other practical works are designed
// to take away your freedom to share and change the works.  By contrast,
// the GNU General Public License is intended to guarantee your freedom to
// share and change all versions of a program--to make sure it remains free
// software for all its users.  We, the Free Software Foundation, use the
// GNU General Public License for most of our software; it applies also to
// any other work released this way by its authors.  You can apply it to
// your programs, too.
//
//   When we speak of free software, we are referring to freedom, not
// price.  Our General Public Licenses are designed to make sure that you
// have the freedom to distribute copies of free software (and charge for
// them if you wish), that you receive source code or can get it if you
// want it, that you can change the software or use pieces of it in new
// free programs, and that you know you can do these things.
//
//   To protect your rights, we need to prevent others from denying you
// these rights or asking you to surrender the rights.  Therefore, you have
// certain responsibilities if you distribute copies of the software, or if
// you modify it: responsibilities to respect the freedom of others.
//
//   For example, if you distribute copies of such a program, whether
// gratis or for a fee, you must pass on to the recipients the same
// freedoms that you received.  You must make sure that they, too, receive
// or can get the source code.  And you must show them these terms so they
// know their rights.
//
//   Developers that use the GNU GPL protect your rights with two steps:
// (1) assert copyright on the software, and (2) offer you this License
// giving you legal permission to copy, distribute and/or modify it.
//
//   For the developers' and authors' protection, the GPL clearly explains
// that there is no warranty for this free software.  For both users' and
// authors' sake, the GPL requires that modified versions be marked as
// changed, so that their problems will not be attributed erroneously to
// authors of previous versions.
//
//   Some devices are designed to deny users access to install or run
// modified versions of the software inside them, although the manufacturer
// can do so.  This is fundamentally incompatible with the aim of
// protecting users' freedom to change the software.  The systematic
// pattern of such abuse occurs in the area of products for individuals to
// use, which is precisely where it is most unacceptable.  Therefore, we
// have designed this version of the GPL to prohibit the practice for those
// products.  If such problems arise substantially in other domains, we
// stand ready to extend this provision to those domains in future versions
// of the GPL, as needed to protect the freedom of users.
//
//   Finally, every program is threatened constantly by software patents.
// States should not allow patents to restrict development and use of
// software on general-purpose computers, but in those that do, we wish to
// avoid the special danger that patents applied to a free program could
// make it effectively proprietary.  To prevent this, the GPL assures that
// patents cannot be used to render the program non-free.
//
//   The precise terms and conditions for copying, distribution and
// modification follow.
//
//                       TERMS AND CONDITIONS
//
//   0. Definitions.
//
//   "This License" refers to version 3 of the GNU General Public License.
//
//   "Copyright" also means copyright-like laws that apply to other kinds of
// works, such as semiconductor masks.
//
//   "The Program" refers to any copyrightable work licensed under this
// License.  Each licensee is addressed as "you".  "Licensees" and
// "recipients" may be individuals or organizations.
//
//   To "modify" a work means to copy from or adapt all or part of the work
// in a fashion requiring copyright permission, other than the making of an
// exact copy.  The resulting work is called a "modified version" of the
// earlier work or a work "based on" the earlier work.
//
//   A "covered work" means either the unmodified Program or a work based
// on the Program.
//
//   To "propagate" a work means to do anything with it that, without
// permission, would make you directly or secondarily liable for
// infringement under applicable copyright law, except executing it on a
// computer or modifying a private copy.  Propagation includes copying,
// distribution (with or without modification), making available to the
// public, and in some countries other activities as well.
//
//   To "convey" a work means any kind of propagation that enables other
// parties to make or receive copies.  Mere interaction with a user through
// a computer network, with no transfer of a copy, is not conveying.
//
//   An interactive user interface displays "Appropriate Legal Notices"
// to the extent that it includes a convenient and prominently visible
// feature that (1) displays an appropriate copyright notice, and (2)
// tells the user that there is no warranty for the work (except to the
// extent that warranties are provided), that licensees may convey the
// work under this License, and how to view a copy of this License.  If
// the interface presents a list of user commands or options, such as a
// menu, a prominent item in the list meets this criterion.
//
//   1. Source Code.
//
//   The "source code" for a work means the preferred form of the work
// for making modifications to it.  "Object code" means any non-source
// form of a work.
//
//   A "Standard Interface" means an interface that either is an official
// standard defined by a recognized standards body, or, in the case of
// interfaces specified for a particular programming language, one that
// is widely used among developers working in that language.
//
//   The "System Libraries" of an executable work include anything, other
// than the work as a whole, that (a) is included in the normal form of
// packaging a Major Component, but which is not part of that Major
// Component, and (b) serves only to enable use of the work with that
// Major Component, or to implement a Standard Interface for which an
// implementation is available to the public in source code form.  A
// "Major Component", in this context, means a major essential component
// (kernel, window system, and so on) of the specific operating system
// (if any) on which the executable work runs, or a compiler used to
// produce the work, or an object code interpreter used to run it.
//
//   The "Corresponding Source" for a work in object code form means all
// the source code needed to generate, install, and (for an executable
// work) run the object code and to modify the work, including scripts to
// control those activities.  However, it does not include the work's
// System Libraries, or general-purpose tools or generally available free
// programs which are used unmodified in performing those activities but
// which are not part of the work.  For example, Corresponding Source
// includes interface definition files associated with source files for
// the work, and the source code for shared libraries and dynamically
// linked subprograms that the work is specifically designed to require,
// such as by intimate data communication or control flow between those
// subprograms and other parts of the work.
//
//   The Corresponding Source need not include anything that users
// can regenerate automatically from other parts of the Corresponding
// Source.
//
//   The Corresponding Source for a work in source code form is that
// same work.
//
//   2. Basic Permissions.
//
//   All rights granted under this License are granted for the term of
// copyright on the Program, and are irrevocable provided the stated
// conditions are met.  This License explicitly affirms your unlimited
// permission to run the unmodified Program.  The output from running a
// covered work is covered by this License only if the output, given its
// content, constitutes a covered work.  This License acknowledges your
// rights of fair use or other equivalent, as provided by copyright law.
//
//   You may make, run and propagate covered works that you do not
// convey, without conditions so long as your license otherwise remains
// in force.  You may convey covered works to others for the sole purpose
// of having them make modifications exclusively for you, or provide you
// with facilities for running those works, provided that you comply with
// the terms of this License in conveying all material for which you do
// not control copyright.  Those thus making or running the covered works
// for you must do so exclusively on your behalf, under your direction
// and control, on terms that prohibit them from making any copies of
// your copyrighted material outside their relationship with you.
//
//   Conveying under any other circumstances is permitted solely under
// the conditions stated below.  Sublicensing is not allowed; section 10
// makes it unnecessary.
//
//   3. Protecting Users' Legal Rights From Anti-Circumvention Law.
//
//   No covered work shall be deemed part of an effective technological
// measure under any applicable law fulfilling obligations under article
// 11 of the WIPO copyright treaty adopted on 20 December 1996, or
// similar laws prohibiting or restricting circumvention of such
// measures.
//
//   When you convey a covered work, you waive any legal power to forbid
// circumvention of technological measures to the extent such circumvention
// is effected by exercising rights under this License with respect to
// the covered work, and you disclaim any intention to limit operation or
// modification of the work as a means of enforcing, against the work's
// users, your or third parties' legal rights to forbid circumvention of
// technological measures.
//
//   4. Conveying Verbatim Copies.
//
//   You may convey verbatim copies of the Program's source code as you
// receive it, in any medium, provided that you conspicuously and
// appropriately publish on each copy an appropriate copyright notice;
// keep intact all notices stating that this License and any
// non-permissive terms added in accord with section 7 apply to the code;
// keep intact all notices of the absence of any warranty; and give all
// recipients a copy of this License along with the Program.
//
//   You may charge any price or no price for each copy that you convey,
// and you may offer support or warranty protection for a fee.
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//   5. Conveying Modified Source Versions.
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//   You may convey a work based on the Program, or the modifications to
// produce it from the Program, in the form of source code under the
// terms of section 4, provided that you also meet all of these conditions:
//
//     a) The work must carry prominent notices stating that you modified
//     it, and giving a relevant date.
//
//     b) The work must carry prominent notices stating that it is
//     released under this License and any conditions added under section
//     7.  This requirement modifies the requirement in section 4 to
//     "keep intact all notices".
//
//     c) You must license the entire work, as a whole, under this
//     License to anyone who comes into possession of a copy.  This
//     License will therefore apply, along with any applicable section 7
//     additional terms, to the whole of the work, and all its parts,
//     regardless of how they are packaged.  This License gives no
//     permission to license the work in any other way, but it does not
//     invalidate such permission if you have separately received it.
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//     d) If the work has interactive user interfaces, each must display
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// used to limit the access or legal rights of the compilation's users
// beyond what the individual works permit.  Inclusion of a covered work
// in an aggregate does not cause this License to apply to the other
// parts of the aggregate.
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//   6. Conveying Non-Source Forms.
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//   You may convey a covered work in object code form under the terms
// of sections 4 and 5, provided that you also convey the
// machine-readable Corresponding Source under the terms of this License,
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//     a) Convey the object code in, or embodied in, a physical product
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//     b) Convey the object code in, or embodied in, a physical product
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//     written offer, valid for at least three years and valid for as
//     long as you offer spare parts or customer support for that product
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//     copy of the Corresponding Source for all the software in the
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//     more than your reasonable cost of physically performing this
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//     Corresponding Source from a network server at no charge.
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//     c) Convey individual copies of the object code with a copy of the
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//
//     d) Convey the object code by offering access from a designated
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//     e) Convey the object code using peer-to-peer transmission, provided
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// included in conveying the object code work.
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//   A "User Product" is either (1) a "consumer product", which means any
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// modified object code on the User Product (for example, the work has
// been installed in ROM).
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// unpacking, reading or copying.
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//   7. Additional Terms.
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//   "Additional permissions" are terms that supplement the terms of this
// License by making exceptions from one or more of its conditions.
// Additional permissions that are applicable to the entire Program shall
// be treated as though they were included in this License, to the extent
// that they are valid under applicable law.  If additional permissions
// apply only to part of the Program, that part may be used separately
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// this License without regard to the additional permissions.
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// add to a covered work, you may (if authorized by the copyright holders of
// that material) supplement the terms of this License with terms:
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//     terms of sections 15 and 16 of this License; or
//
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// received it, or any part of it, contains a notice stating that it is
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//   Moreover, your license from a particular copyright holder is
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// work thus licensed is called the contributor's "contributor version".
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//   A contributor's "essential patent claims" are all patent claims
// owned or controlled by the contributor, whether already acquired or
// hereafter acquired, that would be infringed by some manner, permitted
// by this License, of making, using, or selling its contributor version,
// but do not include claims that would be infringed only as a
// consequence of further modification of the contributor version.  For
// purposes of this definition, "control" includes the right to grant
// patent sublicenses in a manner consistent with the requirements of
// this License.
//
//   Each contributor grants you a non-exclusive, worldwide, royalty-free
// patent license under the contributor's essential patent claims, to
// make, use, sell, offer for sale, import and otherwise run, modify and
// propagate the contents of its contributor version.
//
//   In the following three paragraphs, a "patent license" is any express
// agreement or commitment, however denominated, not to enforce a patent
// (such as an express permission to practice a patent or covenant not to
// sue for patent infringement).  To "grant" such a patent license to a
// party means to make such an agreement or commitment not to enforce a
// patent against the party.
//
//   If you convey a covered work, knowingly relying on a patent license,
// and the Corresponding Source of the work is not available for anyone
// to copy, free of charge and under the terms of this License, through a
// publicly available network server or other readily accessible means,
// then you must either (1) cause the Corresponding Source to be so
// available, or (2) arrange to deprive yourself of the benefit of the
// patent license for this particular work, or (3) arrange, in a manner
// consistent with the requirements of this License, to extend the patent
// license to downstream recipients.  "Knowingly relying" means you have
// actual knowledge that, but for the patent license, your conveying the
// covered work in a country, or your recipient's use of the covered work
// in a country, would infringe one or more identifiable patents in that
// country that you have reason to believe are valid.
//
//   If, pursuant to or in connection with a single transaction or
// arrangement, you convey, or propagate by procuring conveyance of, a
// covered work, and grant a patent license to some of the parties
// receiving the covered work authorizing them to use, propagate, modify
// or convey a specific copy of the covered work, then the patent license
// you grant is automatically extended to all recipients of the covered
// work and works based on it.
//
//  A patent license is "discriminatory" if it does not include within
// the scope of its coverage, prohibits the exercise of, or is
// conditioned on the non-exercise of one or more of the rights that are
// specifically granted under this License.  You may not convey a covered
// work if you are a party to an arrangement with a third party that is
// in the business of distributing software, under which you make payment
// to the third party based on the extent of your activity of conveying
// the work, and under which the third party grants, to any of the
// parties who would receive the covered work from you, a discriminatory
// patent license (a) in connection with copies of the covered work
// conveyed by you (or copies made from those copies), or (b) primarily
// for and in connection with specific products or compilations that
// contain the covered work, unless you entered into that arrangement,
// or that patent license was granted, prior to 28 March 2007.
//
//   Nothing in this License shall be construed as excluding or limiting
// any implied license or other defenses to infringement that may
// otherwise be available to you under applicable patent law.
//
//   12. No Surrender of Others' Freedom.
//
//   If conditions are imposed on you (whether by court order, agreement or
// otherwise) that contradict the conditions of this License, they do not
// excuse you from the conditions of this License.  If you cannot convey a
// covered work so as to satisfy simultaneously your obligations under this
// License and any other pertinent obligations, then as a consequence you may
// not convey it at all.  For example, if you agree to terms that obligate you
// to collect a royalty for further conveying from those to whom you convey
// the Program, the only way you could satisfy both those terms and this
// License would be to refrain entirely from conveying the Program.
//
//   13. Use with the GNU Affero General Public License.
//
//   Notwithstanding any other provision of this License, you have
// permission to link or combine any covered work with a work licensed
// under version 3 of the GNU Affero General Public License into a single
// combined work, and to convey the resulting work.  The terms of this
// License will continue to apply to the part which is the covered work,
// but the special requirements of the GNU Affero General Public License,
// section 13, concerning interaction through a network will apply to the
// combination as such.
//
//   14. Revised Versions of this License.
//
//   The Free Software Foundation may publish revised and/or new versions of
// the GNU General Public License from time to time.  Such new versions will
// be similar in spirit to the present version, but may differ in detail to
// address new problems or concerns.
//
//   Each version is given a distinguishing version number.  If the
// Program specifies that a certain numbered version of the GNU General
// Public License "or any later version" applies to it, you have the
// option of following the terms and conditions either of that numbered
// version or of any later version published by the Free Software
// Foundation.  If the Program does not specify a version number of the
// GNU General Public License, you may choose any version ever published
// by the Free Software Foundation.
//
//   If the Program specifies that a proxy can decide which future
// versions of the GNU General Public License can be used, that proxy's
// public statement of acceptance of a version permanently authorizes you
// to choose that version for the Program.
//
//   Later license versions may give you additional or different
// permissions.  However, no additional obligations are imposed on any
// author or copyright holder as a result of your choosing to follow a
// later version.
//
//   15. Disclaimer of Warranty.
//
//   THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
// APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
// HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
// IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
// ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
//
//   16. Limitation of Liability.
//
//   IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
// WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
// THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
// GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
// USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
// DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
// PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
// EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGES.
//
//   17. Interpretation of Sections 15 and 16.
//
//   If the disclaimer of warranty and limitation of liability provided
// above cannot be given local legal effect according to their terms,
// reviewing courts shall apply local law that most closely approximates
// an absolute waiver of all civil liability in connection with the
// Program, unless a warranty or assumption of liability accompanies a
// copy of the Program in return for a fee.
//--------------------------------------------------------------------------------
<?php
//Defines the sections on the set of web pages and functions to operate on them.
//
//Format is:
//  a)Section level (top level is 0).
//  b)Section tag (Any combination of letters/numbers/underscores, no spaces, case sensitive).
//  c)Section title with no HTML.
//  d)Section title (<i>, </i>, and &mdash;, &ndash;, &nbsp;, and &quot; allowed--nothing else in addition to letters, numbers, underscores, and spaces).
//  e)Path, from document root, to PHP file that will display section (no leading slash).
//  f)Whether this page actually should ever have a link (some are just containers).  0 for no, 1 for yes.
//
//Sections must be in order in the array.
//
$GBL_SEC_sections = 
   array
      (
      array(
           0, 
           "SEC_TITLEPAGE",                        
           "Title Page",                                                                                              
           "Title Page",                                                                                              
           "/sections/title_page/index.php",
           1
           ),
      array(
           0, 
           "SEC_INTRODUCTIONOVERVIEW",                     
           "Introduction and Overview",                                                                                            
           "Introduction and Overview",                                                                                            
           "/sections/introductionoverview/index.php",
           1
           ),
      array(
           0, 
           "SEC_CCTHEORYASSUMPTIONS",                         
           "Card Counting Theory and Simulation Assumptions",                                                                             
           "Card Counting Theory and Simulation Assumptions",                                                                             
           "",
           1
           ),
      array(
           0, 
           "SEC_GAMBRUINTHEORY",                   
           "The Theory of Gambler's Ruin",                                                                            
           "The Theory of Gambler's Ruin",                                                                            
           "",
           1
           ),
      array(
           0, 
           "SEC_BJRCEVAR",                         
           "Blackjack Rule and Casino Environment Variations",                                                        
           "Blackjack Rule and Casino Environment Variations",                                                        
           "",
           1
           ), 
      array(
           1, 
           "SEC_SHOEVSCONTINUOUSSHUF",             
           "Shoe vs. Continuous Shuffler",                                                                            
           "Shoe vs. Continuous Shuffler",                                                                            
           "",
           1
           ),
      array(
           1, 
           "SEC_NDECKS",                           
           "Number of Decks in the Shoe",                                                                             
           "Number of Decks in the Shoe",                                                                             
           "",
           1
           ), 
      array(
           1, 
           "SEC_SHOEPENETRATION",                  
           "Shoe Penetration",                                                                                        
           "Shoe Penetration",                                                                                        
           "",
           1
           ), 
      array(
           1, 
           "SEC_S17H17",                           
           "Dealer Stands or Hits on Soft 17",                                                                        
           "Dealer Stands or Hits on Soft 17",                                                                        
           "",
           1
           ), 
      array( 
           1, 
           "SEC_EARLYLATEASIANSURRENDER",          
           "Early Surrender, Late Surrender, and Asian Surrender",                                                    
           "Early Surrender, Late Surrender, and Asian Surrender",                                                    
           "",
           1
           ), 
      array(
           1, 
           "SEC_BJPAYOUT",                         
           "Blackjack Payout",                                                                                        
           "Blackjack Payout",                                                                                        
           "",
           1
           ), 
      array(
           1, 
           "SEC_PEEKNOPEEK",                       
           "Peek and No Peek",                                                                                        
           "Peek and No Peek",                                                                                        
           "",
           1
           ), 
      array(
           1, 
           "SEC_SPLITSNONACEMAX",                  
           "Maximum Number of Splits for Non-Aces",                                                                   
           "Maximum Number of Splits for Non-Aces",                                                                   
           "",
           1
           ), 
      array(
           1, 
           "SEC_SPLITSACEMAX",                     
           "Maximum Number of Splits for Aces",                                                                       
           "Maximum Number of Splits for Aces",                                                                       
           "",
           1
           ),
      array(
           1, 
           "SEC_DDRESTRICTIONS",                   
           "Ability to Double Down",                                                                                  
           "Ability to Double Down",                                                                                  
           "",
           1
           ), 
      array(
           1, 
           "SEC_DAS",                              
           "Doubling After Splitting",                                                                                
           "Doubling After Splitting",                                                                                
           "",
           1
           ), 
      array(
           1, 
           "SEC_INITBURNCARDOBS",                  
           "Observability of Initial Burn Card",                                                                      
           "Observability of Initial Burn Card",                                                                      
           "",
           1
           ), 
      array(
           1, 
           "SEC_RDC",                              
           "Rate of Dealer Change",                                                                                   
           "Rate of Dealer Change",                                                                                   
           "",
           1
           ), 
      array(
           1, 
           "SEC_DCBURNCARDOBS",                    
           "Visibility of Dealer Change Burn Card",                                                                   
           "Visibility of Dealer Change Burn Card",                                                                   
           "",
           1
           ), 
      array(
           0, 
           "SEC_SIDEBETS",                         
           "Side Bets",                                                                                               
           "Side Bets",                                                                                               
           "",
           1
           ), 
      array(
           1, 
           "SEC_INSURANCE",                        
           "Insurance",                                                                                               
           "Insurance",                                                                                               
           "",
           1
           ), 
      array(
           1, 
           "SEC_SBPERFECTPAIRS",                   
           "Perfect Pairs",                                                                                           
           "Perfect Pairs",                                                                                           
           "",
           1
           ),
      array(
           1, 
           "SEC_SBMATCHTHEDEALER",                 
           "Match the Dealer",                                                                                        
           "Match the Dealer",                                                                                        
           "",
           1
           ), 
      array(
           0, 
           "SEC_GFCCBIPAS",                        
           "General Features of Card Counting, Betting, and Indexed Play as Assumed by bjcceval",              
           "General Features of Card Counting, Betting, and Indexed Play as Assumed by <i>bjcceval</i>",              
           "",
           1
           ), 
      array(
           1, 
           "SEC_MAXTWOIC",                         
           "Maximum of Two Integer Counts",                                                                           
           "Maximum of Two Integer Counts",                                                                           
           "",
           1
           ),
      array(
           1, 
           "SEC_RCTCEA",                           
           "Running Count, True Count, and Excess Aces",                                                              
           "Running Count, True Count, and Excess Aces",                                                              
           "",
           1
           ),
      array(
           1, 
           "SEC_BETTINGSTRATEGY",                  
           "Betting Strategy",                                                                                        
           "Betting Strategy",                                                                                        
           "",
           1
           ), 
      array(
           1, 
           "SEC_INDEXEDPLAY",                      
           "Indexed Play",                                                                                            
           "Indexed Play",                                                                                            
           "",
           1
           ), 
      array(
           0, 
           "SEC_PUBCCBETTIPSTR",                   
           "Published Card Counting, Betting, and Indexed Play Strategies",                                           
           "Published Card Counting, Betting, and Indexed Play Strategies",                                           
           "",
           1
           ), 
      array(
           1, 
           "SEC_HILO",                             
           "Hi-Lo",                                                                                                   
           "Hi-Lo",                                                                                                   
           "",
           1
           ),
      array(
           1, 
           "SEC_KO",                               
           "KO",                                                                                                      
           "KO",                                                                                                      
           "",
           1
           ),
      array(
           1, 
           "SEC_OMEGAII",                          
           "Omega-II",                                                                                                
           "Omega-II",                                                                                                
           "",
           1
           ), 
      array(
           0, 
           "SEC_USINGBJCCEVAL",                    
           "Using the bjcceval Program",                                                                       
           "Using the <i>bjcceval</i> Program",                                                                       
           "",
           1
           ), 
      array(
           1, 
           "SEC_OVERVIEWBJCCEVAL",                 
           "Overview of How the Program Operates",                                                                    
           "Overview of How the Program Operates",                                                                    
           "",
           1
           ), 
      array(
           1, 
           "SEC_HWSWREQ",                          
           "Computer Hardware and Software Requirements",                                                             
           "Computer Hardware and Software Requirements",                                                             
           "",
           1
           ), 
      array(
           1, 
           "SEC_INVOKING",                         
           "Invoking the Program",                                                                                    
           "Invoking the Program",                                                                                    
           "",
           1
           ),
      array(
           1, 
           "SEC_COMMANDLINEARGUMENTS",             
           "Command-Line Arguments",                                                                                  
           "Command-Line Arguments",                                                                                  
           "/sections/bjcceval_cl_args/index.php",
           1
           ), 
      array(
           1, 
           "SEC_OUTPUTFILES",                      
           "Output Files",                                                                                            
           "Output Files",                                                                                            
           "",
           1
           ), 
      array(
           1, 
           "SEC_STRATEGYFILEFORMAT",               
           "Format of a Strategy File",                                                                               
           "Format of a Strategy File",                                                                               
           "",
           1
           ), 
      array(
           0, 
           "SEC_MODIFYINGBJCCEVAL",                
           "Modifying the bjcceval Program",                                                                   
           "Modifying the <i>bjcceval</i> Program",                                                                   
           "",
           1
           ), 
      array(
           1, 
           "SEC_BUILDINGBJCCEVAL",                 
           "Building bjcceval",                                                                                
           "Building <i>bjcceval</i>",                                                                                
           "",
           1
           ), 
      array(
           1, 
           "SEC_MODPRNG",                          
           "Modifying the Pseudo-Random Number Generator",                                                            
           "Modifying the Pseudo-Random Number Generator",                                                            
           "",
           1
           ), 
      array( 
           1, 
           "SEC_ADDCOMMANDLINEPARS",               
           "Adding Command-Line Parameters",                                                                          
           "Adding Command-Line Parameters",                                                                          
           "",
           1
           ),
      array(
           0, 
           "SEC_RESULTSBJCCEVAL",                  
           "Selected Results From the bjcceval Program",                                                       
           "Selected Results From the <i>bjcceval</i> Program",                                                       
           "",
           1
           ), 
      array(
           1, 
           "SEC_EFFECTRULCASVAR",                  
           "Effect of Rule and Casino Environment Variations",                                                        
           "Effect of Rule and Casino Environment Variations",                                                        
           "",
           1
           ), 
      array(
           2, 
           "SEC_CANONICALGAME",                    
           "Canonical Game for Compiling Results",                                                                    
           "Canonical Game for Compiling Results",                                                                    
           "",
           1
           ), 
      array(
           2, 
           "SEC_EFFECTNPLAYERS",                   
           "Effect of Number of Players",                                                                             
           "Effect of Number of Players",                                                                             
           "",
           1
           ), 
      array(
           2, 
           "SEC_EFFECTSEATINGPOS",                 
           "Effect of Seating Position",                                                                              
           "Effect of Seating Position",                                                                             
           "",
           1
           ), 
      array(2, 
           "SEC_INITBURNCARDUNOBS",                
           "Effect of Unobserved Burn Card at the Start of Each Shoe",                                                
           "Effect of Unobserved Burn Card at the Start of Each Shoe",                                                
           "",
           1
           ),
      array(
           2, 
           "SEC_DCBURNCARDUNOBS",                  
           "Effect of Unobserved Burn Card on Change of Dealers",                                                     
           "Effect of Unobserved Burn Card on Change of Dealers",                                                     
           "",
           1
           ), 
      array(
           2, 
           "SEC_EFFECTNDECKS",                     
           "Effect of Number of Decks",                                                                               
           "Effect of Number of Decks",                                                                               
           "",
           1
           ),
      array(
           2, 
           "SEC_EFFECTPENETRATION",                
           "Effect of Shoe Penetration",                                                                              
           "Effect of Shoe Penetration",                                                                              
           "",
           1
           ),
      array(
           2, 
           "SEC_EFFECTDECKESTACCURACY",            
           "Effect of Decks Remaining Estimation Accuracy",                                                           
           "Effect of Decks Remaining Estimation Accuracy",                                                           
           "",
           1
           ), 
      array(
           2, 
           "SEC_EFFECTS17H17",                     
           "Effect of S17 vs. H17",                                                                                   
           "Effect of S17 vs. H17",                                                                                   
           "",
           1
           ),
      array(
           2, 
           "SEC_EFFRESTDD",                        
           "Effect of Restrictions on Doubling Down",                                                                 
           "Effect of Restrictions on Doubling Down",                                                                 
           "",
           1
           ),
      array(
           2, 
           "SEC_EFFNONACESPLITN",                  
           "Effect of Number of Non-Ace Splits Allowed",                                                              
           "Effect of Number of Non-Ace Splits Allowed",                                                              
           "",
           1
           ), 
      array(
           2, 
           "SEC_EFFACESPLITN",                     
           "Effect of Number of Ace Splits Allowed",                                                                  
           "Effect of Number of Ace Splits Allowed",                                                                  
           "",
           1
           ),
      array(
           2, 
           "SEC_EFFDASALLOW",                      
           "Effect of Doubling After Splitting",                                                                      
           "Effect of Doubling After Splitting",                                                                      
           "",
           1
           ),
      array(
           2, 
           "SEC_BCAFODR",                          
           "Betting Correlation as a Function of Decks Remaining",                                                    
           "Betting Correlation as a Function of Decks Remaining",                                                    
           "",
           1
           ), 
      array(
           2, 
           "SEC_PCAFODR",                          
           "Playing Correlation as a Function of Decks Remaining",                                                    
           "Playing Correlation as a Function of Decks Remaining",                                                    
           "",
           1
           ), 
      array(
           2, 
           "SEC_MIIP",                             
           "Most Important Indexed Plays",                                                                            
           "Most Important Indexed Plays",                                                                            
           "",
           1
           ), 
      array(
           2, 
           "SEC_REBVIP",                           
           "Relative Effectiveness of Betting Variation vs. Indexed Play",                                            
           "Relative Effectiveness of Betting Variation vs. Indexed Play",                                            
           "",
           1
           ), 
      array(
           2, 
           "SEC_EFFECTPPSIDEBET",                  
           "Effect of Perfect Pair Side Bet",                                                                         
           "Effect of Perfect Pair Side Bet",                                                                         
           "",
           1
           ),
      array(
           2, 
           "SEC_MTDSIDEBET",                       
           "Effect of Match the Dealer Side Bet",                                                                     
           "Effect of Match the Dealer Side Bet",                                                                     
           "",
           1
           ), 
      array(
           1, 
           "SEC_STRATEGYSELGAMES",                 
           "Strategy for Selected Games",                                                                             
           "Strategy for Selected Games",                                                                             
           "",
           1
           ), 
      array(
           2, 
           "SEC_OUTPUT8DH17NASP4ASP2HL101LINEAR",  
           "8 Deck, H17, NASP4, ASP2, Hi-Lo, 10:1 Linear Bet Spread",                                                 
           "8 Deck, H17, NASP4, ASP2, Hi-Lo, 10:1 Linear Bet Spread",                                                 
           "",
           1
           ), 
      array(
           2, 
           "SEC_OUTPUT8DH17NASP4ASP2HL101BIPOLAR", 
           "8 Deck, H17, NASP4, ASP2, Hi-Lo, 10:1 Bipolar Bet Spread",                                                
           "8 Deck, H17, NASP4, ASP2, Hi-Lo, 10:1 Bipolar Bet Spread",                                                
           "",
           1
           ),
      array(
           2, 
           "SEC_OUTPUT8DH17NASP4ASP2KO101LINEAR",  
           "8 Deck, H17, NASP4, ASP2, KO, 10:1 Linear Bet Spread",                                                    
           "8 Deck, H17, NASP4, ASP2, KO, 10:1 Linear Bet Spread",                                                    
           "",
           1
           ), 
      array(
           2, 
           "SEC_OUTPUT8DH17NASP4ASP2KO101BIPOLAR", 
           "8 Deck, H17, NASP4, ASP2, KO, 10:1 Bipolar Bet Spread",                                                   
           "8 Deck, H17, NASP4, ASP2, KO, 10:1 Bipolar Bet Spread",                                                   
           "",
           1
           ), 
      array(
           2, 
           "SEC_OUTPUT8DH17NASP4ASP2O2101LINEAR",  
           "8 Deck, H17, NASP4, ASP2, Omega-II, 10:1 Linear Bet Spread",                                              
           "8 Deck, H17, NASP4, ASP2, Omega-II, 10:1 Linear Bet Spread",                                              
           "",
           1
           ), 
      array(
           2, 
           "SEC_OUTPUT8DH17NASP4ASP2O2101BIPOLAR", 
           "8 Deck, H17, NASP4, ASP2, Omega-II, 10:1 Bipolar Bet Spread",                                             
           "8 Deck, H17, NASP4, ASP2, Omega-II, 10:1 Bipolar Bet Spread",                                             
           "",
           1
           ),
      array(
           0, 
           "SEC_STRATEGYCARDIPUSECASINO",          
           "Strategy Cards Including Indexed Play that Can Be Used in a Casino",                                      
           "Strategy Cards Including Indexed Play that Can Be Used in a Casino",                                      
           "",
           1
           ), 
      array(
           1, 
           "SEC_NECESSITYCAMOUFLAGEDINFO",         
           "The Necessity of Camouflaged Information",                                                                
           "The Necessity of Camouflaged Information",                                                                
           "",
           1
           ), 
      array(
           1, 
           "SEC_REFCARDCAMOUFLAGEIDEAS",           
           "Camouflage Ideas",                                                                                        
           "Camouflage Ideas",                                                                                        
           "",
           1
           ), 
      array(
           1, 
           "SEC_DOWNLOADABLEREFCARDARTWORK",       
           "Downloadable Artwork",                                                                                    
           "Downloadable Artwork",                                                                                    
           "",
           1
           ), 
      array(
           1, 
           "SEC_STRATEGYCARDSPURCHASE",            
           "Strategy Cards Available for Purchase",                                                                   
           "Strategy Cards Available for Purchase",                                                                   
           "",
           1
           ), 
      array(
           0, 
           "SEC_GLOSSARYOFTERMS",                  
           "Glossary of Terms",                                                                                       
           "Glossary of Terms",                                                                                       
           "",
           1
           ),
      array(
           0, 
           "SEC_GLOSSARYOFVARIABLES",              
           "Glossary of Variables",                                                                                   
           "Glossary of Variables",                                                                                   
           "",
           1
           ), 
      array(
           0, 
           "SEC_REFERENCES",                       
           "References",                                                                                              
           "References",                                                                                              
           "/sections/references/index.php",
           1
           )
      );


//Displays effectively the table of contents.
function GBL_SEC_toc_enum()
   {
   global $GBL_SEC_sections;

   $cur_lvl = 0;

   echo "<ul>\n";

   for ($i=0; $i<count($GBL_SEC_sections); $i++)
      {
      $elem = $GBL_SEC_sections[$i];

      while($cur_lvl > $elem[0])
         {
         $cur_lvl--;

         for ($j=0; $j<(($cur_lvl+2)*3); $j++)
            echo " ";
         echo "</ul>\n";

         for ($j=0; $j<(($cur_lvl+2)*3); $j++)
            echo " ";
         echo "</li>\n";
         } 

      while($cur_lvl < $elem[0])
         {
         for ($j=0; $j<(($cur_lvl+2)*3); $j++)
            echo " ";
         echo "<ul>\n";
         $cur_lvl++;
         } 

      for ($j=0; $j<(($cur_lvl+2)*3); $j++)
         echo " ";

      if (!$elem[5])
         {
         //This target should not have a link at all.
         echo "<li>";
         echo $elem[3];
         }
      else if ($elem[4] === "")
         {
         //The target is under construction.  Link to the under construction page.
         //We have to pass down the section so the navigation works correctly.
         echo "<li><a href=\"/sections/under_construction/index.php?section=";
         echo $elem[1];
         echo "\">";
         echo $elem[3];
         echo " (Under Construction)";
         echo "</a>";
         }
      else
         {
         //The target is live.
         echo "<li><a href=\"";
         echo $elem[4];
         echo "\">";
         echo $elem[3];
         echo "</a>";
         }
      
      if (($i<(count($GBL_SEC_sections)-1)) && ($GBL_SEC_sections[$i+1][0] > $elem[0]))
         {
         //Increasing indent, no "</li>" yet.
         echo "\n";
         }
      else
         {
         echo "</li>\n";
         }
      }

   echo "</ul>\n";
   }


//Returns the index in the sections table as a function of the
//tag, or FALSE if not found.
//
function GBL_SEC_sectionlist_get_index_from_tag($tag_in)
   {
   global $GBL_SEC_sections;

   for ($i=0; $i<count($GBL_SEC_sections); $i++)
      {
      if ($tag_in === $GBL_SEC_sections[$i][1])
         return($i);
      }

   return(FALSE);
   }


//Returns the plain title as a function of the index.
//
function GBL_SEC_sectionlist_get_plain_title_from_index($index_in)
   {
   global $GBL_SEC_sections;

   if ($index_in >= count($GBL_SEC_sections))
      {
      return(FALSE);
      }
   else
      {
      return($GBL_SEC_sections[$index_in][2]);
      }
   }
 

//Returns the HTML rich title as a function of the index.
//
function GBL_SEC_sectionlist_get_html_rich_title_from_index($index_in)
   {
   global $GBL_SEC_sections;

   if ($index_in >= count($GBL_SEC_sections))
      {
      return(FALSE);
      }
   else
      {
      return($GBL_SEC_sections[$index_in][3]);
      }
   }

//Returns the empty string if the page is not under construction or
//" (Under Construction)" if it is.
//
function GBL_SEC_uc_string($index_in)
   {
   global $GBL_SEC_sections;

   if (!is_int($index_in))
      {
      return(""); 
      }  
   else if ($index_in >= count($GBL_SEC_sections))
      {
      return("");
      }
   else if (($GBL_SEC_sections[$index_in][5]) && ($GBL_SEC_sections[$index_in][4] === ""))
      {
      return(" (Under Construction)");
      }
   else
      {
      return("");
      }
   } 


//Does the standard navigation panel as a function of the
//index.
//
function GBL_SEC_nav_panel_standard($index_in)
   {
   global $GBL_SEC_sections;

   echo "<table align=\"center\" width=\"100%\">\n";

   //Row containing navigation arrows.
   echo "   <tr>\n";

   //Left navigation arrow.
   echo "      <td align=\"left\">\n";
   if ((is_int($index_in)) && ($index_in >=1) && ($index_in < count($GBL_SEC_sections)))
      {
      echo "         ";
      echo "<a href=\"";
      if ($GBL_SEC_sections[$index_in-1][4] === "")
         {
         //Under construction.
         echo "/sections/under_construction/index.php?section=";
         echo $GBL_SEC_sections[$index_in-1][1];
         echo "\">";
         echo "<img src=\"/graphics/arrow_thumb_w.png\">";
         echo "</a>\n";
         }
      else
         {
         //Live.
         echo $GBL_SEC_sections[$index_in-1][4];
         echo "\">";
         echo "<img src=\"/graphics/arrow_thumb_w.png\">&nbsp;";
         echo "</a>\n";
         }
      }

   //End of cell containing left navigation arrow.
   echo "      </td>\n";   

   //Up navigation arrow.
   echo "      <td align=\"center\">\n";
   if ((is_int($index_in)) && ($index_in >=1) && ($index_in < count($GBL_SEC_sections)))
      {
      echo "         ";
      echo "<a href=\"";
      if ($GBL_SEC_sections[$index_in-1][4] === "")
         {
         //Under construction.
         echo "/sections/under_construction/index.php?section=";
         echo $GBL_SEC_sections[$index_in-1][1];
         echo "\">";
         echo "<img src=\"/graphics/arrow_thumb_n.png\">";
         echo "</a>\n";
         }
      else
         {
         //Live.
         echo $GBL_SEC_sections[$index_in-1][4];
         echo "\">";
         echo "<img src=\"/graphics/arrow_thumb_n.png\">&nbsp;";
         echo "</a>\n";
         }
      }

   //End of cell containing left navigation arrow.
   echo "      </td>\n";   

   //Next.
   echo "      <td align=\"right\">\n";
   if ((is_int($index_in)) && ($index_in >=1) && ($index_in < count($GBL_SEC_sections)))
      {
      echo "         ";
      echo "<a href=\"";
      if ($GBL_SEC_sections[$index_in-1][4] === "")
         {
         //Under construction.
         echo "/sections/under_construction/index.php?section=";
         echo $GBL_SEC_sections[$index_in-1][1];
         echo "\">";
         echo "<img src=\"/graphics/arrow_thumb_e.png\">";
         echo "</a>\n";
         }
      else
         {
         //Live.
         echo $GBL_SEC_sections[$index_in-1][4];
         echo "\">";
         echo "<img src=\"/graphics/arrow_thumb_e.png\">&nbsp;";
         echo "</a>\n";
         }
      }

   //End of cell containing left navigation arrow.
   echo "      </td>\n";   

   //End of table row containing arrows.
   echo "   </tr>\n";

   //Table row containing textual descriptions.
   echo "   <tr>\n";

   //First panel is left, if that exists.
   echo "      <td align=\"left\">\n";
   if ((is_int($index_in)) && ($index_in >=1) && ($index_in < count($GBL_SEC_sections)))
      {
      echo "         ";
      echo "<a href=\"";
      if ($GBL_SEC_sections[$index_in-1][4] === "")
         {
         //Under construction.
         echo "/sections/under_construction/index.php?section=";
         echo $GBL_SEC_sections[$index_in-1][1];
         echo "\">";
         echo $GBL_SEC_sections[$index_in-1][3];
         echo " (Under Construction)";
         echo "</a>\n";
         }
      else
         {
         //Live.
         echo $GBL_SEC_sections[$index_in-1][4];
         echo "\">";
         echo $GBL_SEC_sections[$index_in-1][3];
         echo "</a>\n";
         }
      }
   
   //End of table cell containing left description.
   echo "      </td>\n";

   //First panel is left, if that exists.
   echo "      <td align=\"center\">\n";
   if ((is_int($index_in)) && ($index_in >=1) && ($index_in < count($GBL_SEC_sections)))
      {
      echo "         ";
      echo "<a href=\"";
      if ($GBL_SEC_sections[$index_in-1][4] === "")
         {
         //Under construction.
         echo "/sections/under_construction/index.php?section=";
         echo $GBL_SEC_sections[$index_in-1][1];
         echo "\">";
         echo $GBL_SEC_sections[$index_in-1][3];
         echo " (Under Construction)";
         echo "</a>\n";
         }
      else
         {
         //Live.
         echo $GBL_SEC_sections[$index_in-1][4];
         echo "\">";
         echo $GBL_SEC_sections[$index_in-1][3];
         echo "</a>\n";
         }
      }
   
   //End of table cell containing left description.
   echo "      </td>\n";

   //First panel is left, if that exists.
   echo "      <td align=\"right\">\n";
   if ((is_int($index_in)) && ($index_in >=1) && ($index_in < count($GBL_SEC_sections)))
      {
      echo "         ";
      echo "<a href=\"";
      if ($GBL_SEC_sections[$index_in-1][4] === "")
         {
         //Under construction.
         echo "/sections/under_construction/index.php?section=";
         echo $GBL_SEC_sections[$index_in-1][1];
         echo "\">";
         echo $GBL_SEC_sections[$index_in-1][3];
         echo " (Under Construction)";
         echo "</a>\n";
         }
      else
         {
         //Live.
         echo $GBL_SEC_sections[$index_in-1][4];
         echo "\">";
         echo $GBL_SEC_sections[$index_in-1][3];
         echo "</a>\n";
         }
      }
   
   //End of table cell containing left description.
   echo "      </td>\n";

   //End of table row containing descriptions.
   echo "   </tr>\n";

   //End of table.
   echo "</table>\n";
   }


//Given an integer index (presumably corresponding to the current section),
//provides:
//   a)The index corresponding to the previous section, or FALSE if this is an invalid concept.
//   b)TRUE if the previous section is under construction, or FALSE otherwise.
//   c)The link corresponding to the previous section, or FALSE if this is an invalid concept.
//   d)The plain text title of the previous section, or FALSE if this is an invalid concept.
//   e)The rich text title of the previous section, or FALSE if this is an invalid concept.
//   f)The index corresponding to the parent section, or FALSE if this is an invalid concept.
//   g)TRUE if the parent section is under construction, or FALSE otherwise.
//   h)The link corresponding to the parent section, or FALSE if this is an invalid concept.
//   i)The plain text title of the parent section, or FALSE if this is an invalid concept.
//   j)The rich text title of the parent section, or FALSE if this is an invalid concept.
//   k)The index corresponding to the next section, or FALSE if this is an invalid concept.
//   l)TRUE if the next section is under construction, or FALSE otherwise.
//   m)The link corresponding to the next section, or FALSE if this is an invalid concept.
//   n)The plain text title of the next section, or FALSE if this is an invalid concept.
//   o)The rich text title of the next section, or FALSE if this is an invalid concept.
//
function GBL_SEC_get_nav_info_by_index( $index_in, 
                                       &$prev_idx_out,
                                       &$prev_is_uc_out, 
                                       &$prev_link_out,
                                       &$prev_plain_title_out,
                                       &$prev_rich_title_out,
                                       &$up_idx_out, 
                                       &$up_is_uc_out,
                                       &$up_link_out,
                                       &$up_plain_title_out,
                                       &$up_rich_title_out,
                                       &$next_idx_out,
                                       &$next_is_uc_out, 
                                       &$next_link_out,
                                       &$next_plain_title_out,
                                       &$next_rich_title_out)
   {
   global $GBL_SEC_sections;

   //Assign all outputs false, to simplify error and exception returns.
   $prev_idx_out              = FALSE; 
   $prev_is_uc_out            = FALSE;
   $prev_link_out             = FALSE;
   $prev_plain_title_out      = FALSE;
   $prev_rich_title_out       = FALSE;
   $up_idx_out                = FALSE;
   $up_is_uc_out              = FALSE; 
   $up_link_out               = FALSE;
   $up_plain_title_out        = FALSE;
   $up_rich_title_out         = FALSE;
   $next_idx_out              = FALSE;
   $next_is_uc_out            = FALSE; 
   $next_link_out             = FALSE;
   $next_plain_title_out      = FALSE;
   $next_rich_title_out       = FALSE;

   //If the index is not integer or it is out of range, must return all FALSE.
   if ((!is_int($index_in)) || ($index_in < 0) || ($index_in >= count($GBL_SEC_sections)))
      return;   

   //Calculate the previous index.  This is the previous page that in fact is intended
   //to be a navigable link.
   $i = $index_in;
   while ($i > 0)
      {
      $i--;
      if ($GBL_SEC_sections[$i][5])
         {
         $prev_idx_out = $i;
         break;
         }
      }

   //Calculate the next index.  This is the next page that is in fact intended to be
   //a navigable link.
   $i = $index_in;
   while ($i < (count($GBL_SEC_sections)-1))
      {
      $i++;
      if ($GBL_SEC_sections[$i][5])
         {
         $next_idx_out = $i;
         break;
         }
      }

   //Calculate the "up" index.  This is the first previous section with a lower
   //indent level, if that exists.
   $i = $index_in;
   $current_indent_level = $GBL_SEC_sections[$i][0];
   while ($i > 0)
      {
      $i--;
      if ((! $GBL_SEC_sections[$i][5]) && ($GBL_SEC_sections[$i][0] < $current_indent_level))
         {
         //We hit a logical parent, but it isn't a link.  We need to keep going up further.
         //By resetting the indent level, we ascend yet further.
         $current_indent_level = $GBL_SEC_sections[$i][0];
         }
      else if (($GBL_SEC_sections[$i][5]) && ($GBL_SEC_sections[$i][0] < $current_indent_level))
         {
         //Found something fitting.
         $up_idx_out = $i;
         break;
         }
      }

   //Form the "prev" link.
   if ($prev_idx_out !== FALSE)
      {
      if ($GBL_SEC_sections[$prev_idx_out][4] != "")
         {
         //Link is live.
         $prev_link_out = $GBL_SEC_sections[$prev_idx_out][4];
         }
      else
         {
         //Link is under construction.
         $prev_link_out  = "/sections/under_construction/index.php?section=" . $GBL_SEC_sections[$prev_idx_out][1];
         $prev_is_uc_out = TRUE;
         }
      }

   //Form the "up" link.
   if ($up_idx_out !== FALSE)
      {
      if ($GBL_SEC_sections[$up_idx_out][4] != "")
         {
         //Link is live.
         $up_link_out = $GBL_SEC_sections[$up_idx_out][4];
         }
      else
         {
         //Link is under construction.
         $up_link_out  = "/sections/under_construction/index.php?section=" . $GBL_SEC_sections[$up_idx_out][1];
         $up_is_uc_out = TRUE;
         }
      }

   //Form the "next" link.
   if ($next_idx_out !== FALSE)
      {
      if ($GBL_SEC_sections[$next_idx_out][4] != "")
         {
         //Link is live.
         $next_link_out = $GBL_SEC_sections[$next_idx_out][4];
         }
      else
         {
         //Link is under construction.
         $next_link_out  = "/sections/under_construction/index.php?section=" . $GBL_SEC_sections[$next_idx_out][1];
         $next_is_uc_out = TRUE;
         }
      }

   //Form the "previous" plain and rich titles.
   if ($prev_idx_out !== FALSE)
      {
      $prev_plain_title_out      = $GBL_SEC_sections[$prev_idx_out][2];
      $prev_rich_title_out       = $GBL_SEC_sections[$prev_idx_out][3];
      }

   //Form the "up" plain and rich titles.
   if ($up_idx_out !== FALSE)
      {
      $up_plain_title_out        = $GBL_SEC_sections[$up_idx_out][2];
      $up_rich_title_out         = $GBL_SEC_sections[$up_idx_out][3];
      }

   //Form the "next" plain and rich titles.
   if ($next_idx_out !== FALSE)
      {
      $next_plain_title_out      = $GBL_SEC_sections[$next_idx_out][2];
      $next_rich_title_out       = $GBL_SEC_sections[$next_idx_out][3];
      }
   }
?>