function show_menu(name){
	for(i=1;i<=5;i++){
		clearTimeout(timerMenu);
		lay=document.getElementById('menu_sub'+i); 
		lay.style.visibility='hidden';
	}
	lay=document.getElementById(name); 
	lay.style.visibility='visible';
}

function hide_menu(name){
	lay=document.getElementById(name); 
	lay.style.visibility='hidden';
}

var timerMenu;
function timer_menu(name) {
	timerMenu = setTimeout('hide_menu(\''+name+'\')',800); 
}

function timer_menu_clear(){
	clearTimeout(timerMenu);
}