/***********************************************
* Contractible Headers script- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for legal use. Last updated Oct 21st, 2003.
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/
// Modified significantly by Rob Minerick
var enablepersist="on" //Enable saving state of content structure using session cookies? (on/off)

var openImg = new Image();
openImg.src = "http://www.bagley.msstate.edu/Images/contract.gif";
var closedImg = new Image();
closedImg.src = "http://www.bagley.msstate.edu/Images/expand.gif";

function swapFolder(objImg) {
  if(objImg.src.indexOf('http://www.bagley.msstate.edu/Images/expand.gif')>-1)
	 objImg.src = openImg.src;
  else
	 objImg.src = closedImg.src;
}

function getElementbyClass(classname){
	ccollect=new Array()
	var inc=0
	var alltags=document.all? document.all : document.getElementsByTagName("*")
	for (i=0; i<alltags.length; i++){
		if (alltags[i].className==classname)
		ccollect[inc++]=alltags[i]
	}
}

function contractcontent(omit){
	var inc=0

	while (ccollect[inc]){
		if (ccollect[inc].id!=omit) {
			ccollect[inc].style.display="none"
		}
		inc++
	}
}

function c(cid){
	var imgID=cid+'H';
	objImg = document.getElementById(imgID);
	objImg.src=closedImg.src;
	document.getElementById(cid).style.display="none";
}

function x(cid) {
	var imgID=cid+'H';
	objImg = document.getElementById(imgID);
	objImg.src=openImg.src;
	document.getElementById(cid).style.display="block";	
}

function expandcontent(cid){
	var imgID=cid+'H';
	objImg = document.getElementById(imgID);

	if (typeof ccollect!="undefined"){
		
		if(document.getElementById(cid).style.display!="block")
			objImg.src=openImg.src;
		else
			objImg.src=closedImg.src;

		document.getElementById(cid).style.display=(document.getElementById(cid).style.display!="block")? "block" : "none"				
	}
}

function revivecontent(){
	contractcontent("omitnothing")
	selectedItem=getselectedItem()
	selectedComponents=selectedItem.split("|")
	for (i=0; i<selectedComponents.length-1; i++) {
		document.getElementById(selectedComponents[i]).style.display="block"
		var imgID=selectedComponents[i]+'H';
		objImg = document.getElementById(imgID);
		objImg.src=openImg.src;
	}
}

function get_cookie(Name) { 
	var search = Name + "="
	var returnvalue = "";
	if (document.cookie.length > 0) {
		offset = document.cookie.indexOf(search)
		if (offset != -1) { 
			offset += search.length
			end = document.cookie.indexOf(";", offset);
			if (end == -1) end = document.cookie.length;
			returnvalue=unescape(document.cookie.substring(offset, end))
		}
	}
	return returnvalue;
}

function getselectedItem(){
	if (get_cookie('navbar') != ""){
		selectedItem=get_cookie('navbar')
		return selectedItem
	}
	else
	return ""
}

function saveswitchstate(){
	var inc=0, selectedItem=""
	while (ccollect[inc]){
	if (ccollect[inc].style.display=="block")
	selectedItem+=ccollect[inc].id+"|"
	inc++
	}
	document.cookie='navbar'+"="+selectedItem+";path=/";
}

function do_onload(){
	getElementbyClass("branch")
	if (enablepersist=="on" && typeof ccollect!="undefined")
	revivecontent()
}


if (window.addEventListener)
	window.addEventListener("load", do_onload, false)
else if (window.attachEvent)
	window.attachEvent("onload", do_onload)
else if (document.getElementById)
	window.onload=do_onload

if (enablepersist=="on" && document.getElementById)
	window.onunload=saveswitchstate