//this function toggles the status of a list
	function toggle(list,parent){ 
		var listElementStyle = document.getElementById(list).style;
		var parentClass = document.getElementById(parent);
		var imgSrc = parentClass.getElementsByTagName('img')[0];
		
		if (listElementStyle.display=="none"){ 
			listElementStyle.display="block";
			parentClass.className="open";
			imgSrc.setAttribute('src','/images/ui/misc/minus_btn.gif');
			imgSrc.setAttribute('alt','close menu');
		}	else{ 
			listElementStyle.display="none";
			parentClass.className="closed";
			imgSrc.setAttribute('src','/images/ui/misc/plus_btn.gif');
			imgSrc.setAttribute('alt','open menu');
		}
	}