function SwitchMenu(obj){
	if(document.getElementById){
	var el = document.getElementById(obj);
	var ar = document.getElementsByTagName("table");
		if(el.style.display != "block"){
			for (var i=0; i<ar.length; i++){
				if (ar[i].className=="pm")
				ar[i].style.display = "none";}
			el.style.display = "block";}
			else{el.style.display = "none";}	}}