var timeout	= 100;
var closetimer	= 0;
var ddmenuitem	= 0;
function mopen(id) {	
	mcancelclosetime();
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
}
function mclose() { if(ddmenuitem) ddmenuitem.style.visibility = 'hidden'; }
function mclosetime() { closetimer = window.setTimeout(mclose, timeout); }
function mcancelclosetime() {
	if(closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
document.onclick = mclose;