// JavaScript Document

var url = location.href;
if (url.indexOf('index') != -1){
	//alert(url);
	document.getElementById('nav_home').className = 'nav_active';
} else if (url.indexOf('overview') != -1){
	//alert(url);
	document.getElementById('nav_overview').className = 'nav_active';
} else if (url.indexOf('instructions') != -1){
	//alert(url);
	document.getElementById('nav_instructions').className = 'nav_active';
} else if (url.indexOf('faqs') != -1){
	//alert(url);
	document.getElementById('nav_faqs').className = 'nav_active';
} else if (url.indexOf('about') != -1){
	//alert(url);
	document.getElementById('nav_about').className = 'nav_active';
} else if (url.indexOf('help') != -1){
	//alert(url);
	document.getElementById('nav_help').className = 'nav_active';
} else {}


function toggleLayer( whichLayer, desc )
	{
	  var elem, vis;
	  if( document.getElementById ) // this is the way the standards work
	    elem = document.getElementById( whichLayer );
	  else if( document.all ) // this is the way old msie versions work
	      elem = document.all[whichLayer];
	  else if( document.layers ) // this is the way nn4 works
	    elem = document.layers[whichLayer];
	  vis = elem.style;
	  
	  img_id = 'tree_'+whichLayer;
	  //alert(img_id);
	  //alert(document.getElementById(img_id).src);
	  if ( (document.getElementById(img_id).src).indexOf('icon-plus.gif') != -1) {
	  	document.getElementById(img_id).src = 'images/course_overview/icon-minus.gif';
	  } else if ( (document.getElementById(img_id).src).indexOf('icon-minus.gif') != -1) {
	  	document.getElementById(img_id).src = 'images/course_overview/icon-plus.gif';
	  }
		
	  // if the style.display value is blank we try to figure it out here
	  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
	    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
	  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
	  
	 }
	 
	 function isCookieEnabled(){
		
		var cookieEnabled=(navigator.cookieEnabled)? true : false
		
		//if not IE4+ nor NS6+
		if (typeof navigator.cookieEnabled=="undefined" && !cookieEnabled){ 
		document.cookie="testcookie"
		cookieEnabled=(document.cookie.indexOf("testcookie")!=-1)? true : false
		}
		
		if (cookieEnabled) {
			alert("PASS! Cookies are enabled on your browser");		
			
		} else {
			alert("FAIL! Cookies are NOT enabled on your browser");	
		}//if cookies are enabled on client's browser
		//do whatever
		

	 }