function SwitchMenu(obj){
		if(document.getElementById){
		var el = document.getElementById(obj);
		var ar = document.getElementById("cont").getElementsByTagName("span");
			if(el.style.display == "none"){
				for (var i=0; i<ar.length; i++){
					ar[i].style.display = "none";
				}
				el.style.display = "block";
			}else{
				el.style.display = "none";
			}
		}
	}
	function ChangeClass(menu, newClass) { 
		 if (document.getElementById) { 
			document.getElementById(menu).className = newClass;
		 } 
	}