// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. 
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

function DynamicOptionList(){if(arguments.length < 2){alert("Not enough arguments in DynamicOptionList()");
}this.target = arguments[0];
this.dependencies = new Array();
for(var i=1;
i<arguments.length;
i++){this.dependencies[this.dependencies.length] = arguments[i];
}this.form = null;
this.dependentValues = new Object();
this.defaultValues = new Object();
this.options = new Object();
this.delimiter = "|";
this.longestString = "";
this.numberOfOptions = 0;
this.addOptions = DynamicOptionList_addOptions;
this.populate = DynamicOptionList_populate;
this.setDelimiter = DynamicOptionList_setDelimiter;
this.setDefaultOption = DynamicOptionList_setDefaultOption;
this.printOptions = DynamicOptionList_printOptions;
this.init = DynamicOptionList_init;
}
function DynamicOptionList_setDelimiter(val){this.delimiter = val;
}
function DynamicOptionList_setDefaultOption(condition, val){if(typeof this.defaultValues[condition] == "undefined" || this.defaultValues[condition]==null){this.defaultValues[condition] = new Object();
}for(var i=1;
i<arguments.length;
i++){this.defaultValues[condition][arguments[i]]=1;
}}
function DynamicOptionList_init(theform){this.form = theform;
this.populate();
}
function DynamicOptionList_addOptions(dependentValue){if(typeof this.options[dependentValue] != "object"){this.options[dependentValue] = new Array();
}for(var i=1;
i<arguments.length;
i+=2){if(arguments[i].length > this.longestString.length){this.longestString = arguments[i];
}this.numberOfOptions++;
this.options[dependentValue][this.options[dependentValue].length] = arguments[i];
this.options[dependentValue][this.options[dependentValue].length] = arguments[i+1];
}}
function DynamicOptionList_printOptions(){if((navigator.appName == 'Netscape') &&(parseInt(navigator.appVersion) <= 4)){var ret = "";
for(var i=0;
i<this.numberOfOptions;
i++){ret += "<OPTION>";
}ret += "<OPTION>"
for(var i=0;
i<this.longestString.length;
i++){ret += "_";
}document.writeln(ret);
}}
function DynamicOptionList_populate(){var theform = this.form;
var i,j,obj,obj2;
this.dependentValues = new Object;
var dependentValuesInitialized = false;
for(i=0;
i<this.dependencies.length;
i++){var sel = theform[this.dependencies[i]];
var selName = sel.name;
if(!dependentValuesInitialized){dependentValuesInitialized = true;
for(j=0;
j<sel.options.length;
j++){if(sel.options[j].selected){this.dependentValues[sel.options[j].value] = true;
}}}else{var tmpList = new Object();
var newList = new Object();
for(j=0;
j<sel.options.length;
j++){if(sel.options[j].selected){tmpList[sel.options[j].value] = true;
}}for(obj in this.dependentValues){for(obj2 in tmpList){newList[obj + this.delimiter + obj2] = true;
}}this.dependentValues = newList;
}}var targetSel = theform[this.target];
var targetSelected = new Object();
for(i=0;
i<targetSel.options.length;
i++){if(targetSel.options[i].selected){targetSelected[targetSel.options[i].value] = true;
}}targetSel.options.length = 0;
for(i in this.dependentValues){if(typeof this.options[i] == "object"){var o = this.options[i];
for(j=0;
j<o.length;
j+=2){var text = o[j];
var val = o[j+1];
targetSel.options[targetSel.options.length] = new Option(text, val, false, false);
if(typeof this.defaultValues[i] != "undefined" && this.defaultValues[i]!=null){for(def in this.defaultValues[i]){if(def == val){targetSelected[val] = true;
}}}}}}targetSel.selectedIndex=-1;
for(i=0;
i<targetSel.options.length;
i++){if(targetSelected[targetSel.options[i].value] != null && targetSelected[targetSel.options[i].value]==true){targetSel.options[i].selected = true;
}}}