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// Universal Related Select Menus 3-D - cascading popdown menus
// (Dynamically-sized related menus using JS 1.1's new Option cmd)
// by Andrew King. v1.34 19990720
// Copyright (c) 1999 internet.com LLC. All Rights Reserved.
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// Originally published and documented at http://www.webreference.com
// Contact aking@internet.com for all other uses.
//
// Change History
// 3-3-96 code optimized, modularized, and made universal-abk
// 3-8-97 jumpPage1 and 2 consolidated into generalized func
// 3-10-97 changeMenu added jumpPage(0,0), for non-ns3 browsers
// make popup act like a live popup when no related functionality
// 8-5-97 browser detect script changed to check for option functionality
// 9-11-97 aln changed to options.length, as IE 4 does not support
// nulling out options
// 12-22-98 added SIZE att to make select lists, used named forms/elements
// 1-1-99 added getFormNum to fix netscape 2 bug (doesn't support named fms)
//  pass formName, elementNum to relate and jmp as workaround
//  pass this.form,0 and increment instead of decrement in relate to get 
//   next form
//  assumes menu2 follows menu1 in HTML
// tested in mac ie3.01/ns2.02 (live), ns 3.01,4.05,4.5 and ie4.01 related
// 990204 - adopted a more modular/oo approach using two D arrays thanks
//   to "Cyanide _7" <leo7278@hotmail.com> for his help
// 990211 relate2 works! no text - value for second dim array
//    works! relate calls relate2 (using fromRelate kludge) for 3 related menus
// 990701 - bug fix in related select lists - click on second menu's list,
//  get an error as there's no selected option in first menu in a list, 
//  one fix is default to selected first menu's option - abk
// 990701 - fixed back button bug in ie4+ by resetting all forms onload
//      fromRelate var kludge eliminated, added to relate2 as param
//    thanks to peter belesis (pbel@internet.com) for this fix
// 990714 - added IE5 persistence - abk pb
// 990715 - went open source, created stripped down example files - abk
// 990720 - jmp() fix getFormNum(formName);->
//     var formNum = getFormNum(formName);
//  if (v) {..} added around newCat array creation for old browsers
// 990721 - getFormNum/relate tweaks, unnec code removed, 
//     ns2.0 mac fix - getFormNum returns -1 in nested tables
//     new jmp bypasses prob - thx to thanks to Michael Guitton
//     saramaca@mail.dotcom.fr
// 990722 - var for scope added, jmp chgd to named form for ns2.02 bug-abk

// Modified by Dan Jacobs 010102
// perl script to create categories and subcategories based on external database
// included mouseover library functions and images

if(v){a=new Array(22);aln=22;}

function getFormNum (formName) {
	var formNum =-1;
	for (i=0;i<document.forms.length;i++){
		tempForm = document.forms[i];
		if (formName == tempForm) {
			formNum = i;
			correctForm = tempForm;
			break;
		}
	}
	return formNum;
}


function jmp(form, elt)
// The first parameter is a reference to the form.
{
	if (form != null) {
		with (form.elements[elt]) {
			if (0 <= selectedIndex) {
				//location = options[selectedIndex].value;
alert('options[selectedIndex].value =\n' + options[selectedIndex].value);
				location = 'http://www.mdsg.umd.edu/Education/AinA/rsch-display.pl?picked=' + options[selectedIndex].value;
 

               }
		}
	}
}

var catsIndex = -1;
var itemsIndex;
var subItemsIndex;

function newCat(){
	catsIndex++;
	a[catsIndex] = new Array();
	itemsIndex = -1;
}

function O(url,txt) {
     if (!txt) { txt = url; }
	itemsIndex++;
	a[catsIndex][itemsIndex] = new Array();
	a[catsIndex][itemsIndex].text = txt;
	a[catsIndex][itemsIndex].value = url;
	subItemsIndex = 0;
}

function OO(url,txt) {
     if (!txt) { txt = url; }
	a[catsIndex][itemsIndex][subItemsIndex] = new myOptions(txt,url);
	subItemsIndex++;
}

function myOptions(txt,url){
	this.text = txt;
	this.value = url;
}

// fill array

// MOVED TO ANOTHER JAVASCRIPT

function relate(formName,elementNum,j) {
// relate first to second (and third) menus
// ie change first menu, changes second, then change third
//
if(v){
var formNum = getFormNum(formName);
 if (formNum>=0) {
	formNum++; // reference next form, assume it follows in HTML
	with (document.forms[formNum].elements[elementNum]) {
		for(i=options.length-1;i>0;i--) options[i] = null; // null out in reverse order (bug workarnd)
		for(i=0;i<a[j].length;i++){
			options[i] = new Option(a[j][i].text,a[j][i].value); 
		}
		options[0].selected = true;
	}
// change third menu
relate2(formName,elementNum,0,1);
 }
} else {
jmp(formName,elementNum);
}
}

function relate2(formName,elementNum,j,fromRelate) {
if(v){
var formNum = getFormNum(formName);
 if (formNum>=0) {
	// find first menu's selection
	// fromRelate means "coming from relate function?" 
	//   then increment formNum so k refers to first form, 
	//   not the nonexistent one before it (-1)
	if (fromRelate) formNum++; // assumes forms follow each other 
	k = document.forms[formNum-1].elements[elementNum].selectedIndex;
	if(k<0)k=0; // precaution against missing selected in first menu list - abk
	formNum++; // reference next form, assume it follows in HTML
	with (document.forms[formNum].elements[elementNum]) {
		for(i=options.length-1;i>0;i--) options[i] = null; // null out in reverse order (bug workarnd)
		for(i=0;i<a[k][j].length;i++){
			options[i] = new Option(a[k][j][i].text,a[k][j][i].value); 
		}
		options[0].selected = true;
	}
 }
} else {
jmp(formName,elementNum);
}
}

// BACK BUTTON FIX for ie4+- or
// MEMORY-CACHE-STORING-ONLY-INDEX-AND-NOT-CONTENT
//
// from peter belesis:
// IE4+ remembers the index of each SELECT but NOT the CONTENTS of each
// SELECT, so it gets it wrong.
//
// it has to do with MEMORY CACHE (where form input is stored) and how
// IE stores information about SELECT menus.
//
// IE stores the selectedINDEX ONLY of the SELECT menu, not the
// CONTENTS-AT-THE-TIME-OF-SELECTION
//
// when we return to a page, it displays the default contents of each
// SELECT, grabs the stored index from cache and aligns the default
// contents to that index.
// 
// Netscape, on the other hand, seems to remember both INDEX and CONTENTS
// added ie5 persistence 990714

function IEsetup(){
	if(!document.all) return;
	IE5 = navigator.appVersion.indexOf("5.")!=-1;
	if(!IE5) {
		for (i=0;i<document.forms.length;i++) {
			document.forms[i].reset();
		}
	}
}

window.onload = IEsetup;

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