/***********************************************
* Switch Menu script- by Martial B of http://getElementById.com/
* Modified by Dynamic Drive for format & NS4/IE4 compatibility
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

var persistmenu="yes" //"yes" or "no". Make sure each SPAN content contains an incrementing ID starting at 1 (id="sub1", id="sub2", etc)
var persisttype="sitewide" //enter "sitewide" for menu to persist across site, "local" for this page only

if (document.getElementById){ //DynamicDrive.com change
document.write('<style type="text/css">\n')
document.write('.submenu{display: none;}\n')
document.write('</style>\n')
}

function SwitchMenu(obj, section){
	if(document.getElementById){
	var el = document.getElementById(obj);
	var ar = document.getElementById("masterdiv").getElementsByTagName("span"); //DynamicDrive.com change
		if(el.style.display != "block"){ //DynamicDrive.com change
			for (var i=0; i<ar.length; i++){
				if (ar[i].className=="submenu") //DynamicDrive.com change
				ar[i].style.display = "none";
			}
			el.style.display = "block";
		}else{
			el.style.display = "none";
		}
	}
}

/* Retrieve from the cookie */
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;
}

/* Load this function to set the text size initially */
function onloadfunction(){
  if (persistmenu=="yes"){
     var cookiename=(persisttype=="sitewide")? "switchmenu" : window.location.pathname
     var cookievalue=get_cookie(cookiename)
     if (cookievalue!="")
        document.getElementById(cookievalue).style.display="block"
  }
}

/* Save the state for the left menu */
function savemenustate() {
  var inc=1, blockid=""
  /* Department=1-5, Graduate=6-10, Undergraduate=11-15, Safety=16-20, Library=21-25 */
  var dirs=window.location.href.split('/');  
  var section=dirs[dirs.length-2];

  if (section == "chemistry")
     inc=1;
  else if (section == "grad")
     inc=6;
  else if (section == "undergrad")
     inc=11;
  else if (section == "safety")
     inc=16;
  else
     inc=1;

  while (document.getElementById("sub"+inc)) {
     if (document.getElementById("sub"+inc).style.display=="block") {
        blockid="sub"+inc
        break
     }
     inc++
  }
  var cookiename=(persisttype=="sitewide")? "switchmenu" : window.location.pathname
  var cookievalue=(persisttype=="sitewide")? blockid+";path=/" : blockid
  document.cookie=cookiename+"="+cookievalue
}

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

if (persistmenu=="yes" && document.getElementById)
   window.onunload=savemenustate