function showMenu(m){
	obj = document.getElementById(m);
	obj.style.visibility = "visible";
}
function hideMenu(m){
	obj = document.getElementById(m);
	obj.style.visibility = "hidden";
}

document.onclick = function hideAll(){
	hideMenu('sub1');
	hideMenu('sub2');
	hideMenu('sub3');
	hideMenu('sub4');
//	hideMenu('sub_sub1');
}