var timeout=500;
var closetimer=null;
var menuitem=0;
function mopen(id)
{	mcancelclosetime();
    if(menuitem) menuitem.style.visibility='hidden';
	menuitem = document.getElementById(id);
	menuitem.style.visibility='visible';
}
function mclose() { if(menuitem) menuitem.style.visibility='hidden'; }
function mclosetime() { closetimer=window.setTimeout(mclose,timeout); }
function mcancelclosetime()
{	if(closetimer)
	{	window.clearTimeout(closetimer);
		closetimer=null;
	}
}
document.onclick=mclose;