var old = '';
function SwitchMenu(obj){
	/*
	if(old!='' && old!=document.getElementById(obj)){
		old.style.display = "none";
	}
	*/
	if(document.getElementById){
	var el = document.getElementById(obj);
		if(el.style.display != "block"){
			el.style.display = "block";
		}else{
			el.style.display = "none";
		}
	}
	old = el;
}