function switchcontent(className, filtertag) {
	this.className = className
	this.collapsePrev = false //Default: Collapse previous content each time
	this.persistType = "none" //Default: Disable persistence
	//Limit type of element to scan for on page for switch contents if 2nd function parameter is defined, for efficiency sake (ie: "div")
	this.filter_content_tag = (typeof filtertag != "undefined")? filtertag.toLowerCase() : ""
}

switchcontent.prototype.setStatus = function(openHTML, closeHTML) { //PUBLIC: Set open/ closing HTML indicator. Optional
	this.statusOpen = openHTML
	this.statusClosed = closeHTML
}

switchcontent.prototype.setColor = function(openColor, closeColor) { //PUBLIC: Set open/ closing color of switch header. Optional
	this.colorOpen = openColor
	this.colorClosed = closeColor
}

switchcontent.prototype.setPersist = function(bool, days) { //PUBLIC: Enable/ disable persistence. Default is false.
	if (bool) { //if enable persistence
		if (typeof days == "undefined") //if session only
			this.persistType = "session";
		else { //else if non session persistent
			this.persistType = "days";
			this.persistDays=parseInt(days);
		}
	} else this.persistType="none"
}

switchcontent.prototype.collapsePrevious = function(bool) { //PUBLIC: Enable/ disable collapse previous content. Default is false.
	this.collapsePrev = bool;
}


switchcontent.prototype.sweepToggle = function(setting) { //PUBLIC: Expand/ contract all contents method. (Values: "contract"|"expand")
	if (typeof this.headers!="undefined" && this.headers.length>0) { //if there are switch contents defined on the page
		for (var i=0; i<this.headers.length; i++) {
			if (setting == "expand") this.expandcontent(this.headers[i]); //expand each content
			else if (setting == "contract") this.contractcontent(this.headers[i]); //contract each content
		}
	}
}

switchcontent.prototype.defaultExpanded = function() {
	var expandedindices = []; //Array to hold indices (position) of content to be expanded by default
	//Loop through function arguments, and store each one within array
	//Two test conditions: 1) End of Arguments array, or 2) If "collapsePrev" is enabled, only the first entered index (as only 1 content can be expanded at any time)
	for (var i=0; (!this.collapsePrev && i<arguments.length) || (this.collapsePrev && i==0); i++) expandedindices[expandedindices.length] = arguments[i];
	this.expandedindices = expandedindices.join(","); //convert array into a string of the format: "0,2,3" for later parsing by script
}

//PRIVATE: Sets color of switch header.

switchcontent.prototype.togglecolor = function(header, status) {
	if (typeof this.colorOpen != "undefined")
		header.style.color = status;
}

//PRIVATE: Sets status indicator HTML of switch header.

switchcontent.prototype.togglestatus = function(header, status) {
	if (typeof this.statusOpen != "undefined")
		header.firstChild.innerHTML = status;
}

//PRIVATE: Contracts a content based on its corresponding header entered

switchcontent.prototype.contractcontent = function(header) {
	var innercontent = document.getElementById(header.id.replace("-title", "")); //Reference content for this header
	innercontent.style.display = "none";
	this.togglestatus(header,this.statusClosed);
	this.togglecolor(header,this.colorClosed);
}


//PRIVATE: Expands a content based on its corresponding header entered

switchcontent.prototype.expandcontent = function(header) {
	var innercontent = document.getElementById(header.id.replace("-title", ""));
	innercontent.style.display = "block";
	this.togglestatus(header,this.statusOpen);
	this.togglecolor(header,this.colorOpen);
}


switchcontent.prototype.toggledisplay = function(header) {
	var innercontent = document.getElementById(header.id.replace("-title", "")); //Reference content for this header
	if (innercontent.style.display == "block")
		this.contractcontent(header);
	else {
		this.expandcontent(header);
		if (this.collapsePrev && typeof this.prevHeader!="undefined" && this.prevHeader.id!=header.id) // If "Collapse Previous" is enabled and there's a previous open content
			this.contractcontent(this.prevHeader); //Contract that content first
	}
	if (this.collapsePrev)
		this.prevHeader = header; //Set current expanded content as the next "Previous Content"
}

switchcontent.prototype.collectElementbyClass = function(classname) { //Returns an array containing DIVs with specified classname
	var classnameRE = new RegExp("(^|\\s+)"+classname+"($|\\s+)","i"); //regular expression to screen for classname within element
	this.headers=[], this.innercontents=[]
	if (this.filter_content_tag!="") //If user defined limit type of element to scan for to a certain element (ie: "div" only)
		var allelements = document.getElementsByTagName(this.filter_content_tag);
	else //else, scan all elements on the page!
		var allelements = document.all? document.all : document.getElementsByTagName("*");
	for (var i=0; i<allelements.length; i++) {
		if (typeof allelements[i].className=="string" && allelements[i].className.search(classnameRE)!=-1) {
			if (document.getElementById(allelements[i].id+"-title")!=null) { //if header exists for this inner content
				this.headers[this.headers.length] = document.getElementById(allelements[i].id+"-title"); //store reference to header intended for this inner content
				this.innercontents[this.innercontents.length] = allelements[i]; //store reference to this inner content
			}
		}
	}
}


//PRIVATE: init()- Initializes Switch Content function (collapse contents by default unless exception is found)

switchcontent.prototype.init = function() {
	var instanceOf = this;
	this.collectElementbyClass(this.className); //Get all headers and its corresponding content based on shared class name of contents
	if (this.headers.length==0) return; //If no headers are present (no contents to switch), just exit
	//If admin has changed number of days to persist from current cookie records, reset persistence by deleting cookie
	if (this.persistType=="days" && (parseInt(switchcontent.getCookie(this.className+"_dtrack"))!=this.persistDays))
		switchcontent.setCookie(this.className+"_d", "", -1); //delete cookie
	// Get ids of open contents below. Four possible scenerios:
	// 1) Session only persistence is enabled AND corresponding cookie contains a non blank ("") string
	// 2) Regular (in days) persistence is enabled AND corresponding cookie contains a non blank ("") string
	// 3) If there are contents that should be enabled by default (even if persistence is enabled and this IS the first page load)
	// 4) Default to no contents should be expanded on page load ("" value)
	var opencontents_ids=(this.persistType=="session" && switchcontent.getCookie(this.className)!="")? ','+switchcontent.getCookie(this.className)+',' : (this.persistType=="days" && switchcontent.getCookie(this.className+"_d")!="")? ','+switchcontent.getCookie(this.className+"_d")+',' : (this.expandedindices)? ','+this.expandedindices+',' : ""
	for (var i=0; i<this.headers.length; i++){ //BEGIN FOR LOOP
		if (typeof this.statusOpen!="undefined") //If open/ closing HTML indicator is enabled/ set
			this.headers[i].innerHTML='<span class="status"></span>'+this.headers[i].innerHTML //Add a span element to original HTML to store indicator
		if (opencontents_ids.indexOf(','+i+',')!=-1){ //if index "i" exists within cookie string or default-enabled string (i=position of the content to expand)
			this.expandcontent(this.headers[i]) //Expand each content per stored indices (if ""Collapse Previous" is set, only one content)
			if (this.collapsePrev) //If "Collapse Previous" set
			this.prevHeader=this.headers[i]  //Indicate the expanded content's corresponding header as the last clicked on header (for logic purpose)
		}
		else //else if no indices found in stored string
			this.contractcontent(this.headers[i]) //Contract each content by default
		this.headers[i].onclick=function(){instanceOf.toggledisplay(this);}
	} //END FOR LOOP
	switchcontent.dotask(window, function(){instanceOf.rememberpluscleanup()}, "unload") //Call persistence method onunload
}


//Function to store index of opened ULs relative to other ULs in Tree into cookie:
switchcontent.prototype.rememberpluscleanup = function() {
	//Define array to hold ids of open content that should be persisted
	//Default to just "none" to account for the case where no contents are open when user leaves the page (and persist that):
	var opencontents = new Array("none")
	for (var i=0; i<this.innercontents.length; i++) {
		//If persistence enabled, content in question is expanded, and either "Collapse Previous" is disabled, or if enabled, this is the first expanded content
		if (this.persistType!="none" && this.innercontents[i].style.display=="block" && (!this.collapsePrev || (this.collapsePrev && opencontents.length<2)))
			opencontents[opencontents.length]=i //save the index of the opened UL (relative to the entire list of ULs) as an array element
		this.headers[i].onclick=null; //Cleanup code
	}
	if (opencontents.length>1) //If there exists open content to be persisted
		opencontents.shift(); //Boot the "none" value from the array, so all it contains are the ids of the open contents
	if (typeof this.statusOpen!="undefined")
		this.statusOpen = this.statusClosed = null; //Cleanup code
	if (this.persistType=="session") //if session only cookie set
		switchcontent.setCookie(this.className, opencontents.join(",")); //populate cookie with indices of open contents: classname=1,2,3,etc
	else if (this.persistType=="days" && typeof this.persistDays=="number") { //if persistent cookie set instead
		switchcontent.setCookie(this.className+"_d", opencontents.join(","), this.persistDays); //populate cookie with indices of open contents
		switchcontent.setCookie(this.className+"_dtrack", this.persistDays, this.persistDays); //also remember number of days to persist (int)
	}
}

// -------------------------------------------------------------------
// A few utility functions below:
// -------------------------------------------------------------------

switchcontent.dotask = function(target,functionref,tasktype) { //assign a function to execute to an event handler (ie: onunload)
	var tasktype = (window.addEventListener)? tasktype : "on"+tasktype
	if (target.addEventListener)
		target.addEventListener(tasktype, functionref, false)
	else if (target.attachEvent)
		target.attachEvent(tasktype, functionref);
}

switchcontent.getCookie = function(Name) { 
	var re = new RegExp(Name+"=[^;]+","i"); // construct RE to search for target name/value pair
	if (document.cookie.match(re)) // if cookie found
		return document.cookie.match(re)[0].split("=")[1]; // return its value
	return "";
}

switchcontent.setCookie = function(name, value, days) {
	if (typeof days != "undefined") { //if set persistent cookie
		var expireDate = new Date();
		var expstring=expireDate.setDate(expireDate.getDate()+days);
		document.cookie = name+"="+value+"; expires="+expireDate.toGMTString();
	}
	else //else if this is a session only cookie
		document.cookie = name+"="+value;
}