function $$(id){return document.getElementById(id);}
//show-hide:layer
var nolayer=1;show=1;
function showlayer(obj){nolayer=0;hidelayer();$$(obj).style.display="block";}
function hidelayer(){
	var i=1;
	while ($$("menu"+i) != null){
		$$("menu"+i).style.display="none";
		i++;
	}
}
$(document).ready(function(){
	document.onclick=function(){if(nolayer){hidelayer();}nolayer=1;}
});