function SwitchMenu(obj){
	if(document.getElementById){
		var el = document.getElementById(obj);
		var ar = document.getElementById("menu").getElementsByTagName("span");

		if (el.style.display == "block") {
			el.style.display = "none";
		}
		else {
			for (var i=0; i<ar.length; i++){
				ar[i].style.display = "none";
			}
			el.style.display = "block";
		}

	}
}