// Copyright 2006-2007 javascript-array.com
var timeout	= 0;
var closetimer	= 0;
var ddmenuitem	= 0;
// open hidden layer
function mopen(id) {	
		// cancel close timer
		mcancelclosetime();
		// close old layer
		if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
		// get new layer and show it
		ddmenuitem = document.getElementById(id);
		ddmenuitem.style.visibility = 'visible';
	}
// close showed layer
function mclose() {
		if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	}
// go close timer
function mclosetime() {
	closetimer = window.setTimeout(mclose, timeout);
}
// cancel close timer
function mcancelclosetime() {
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
// close layer when click-out
document.onclick = mclose;