// Copyright 2006-2007 javascript-array.com
var timeout	= 100;
var closetimer	= 0;
var ddmenuitem	= 0;
// open hidden layer
function show_sub(id)
{	
	mcancelclosetime();
	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
}
// close showed layer
function hide_sub()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}
// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(hide_sub, timeout);
}
// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
// close layer when click-out
document.onclick = hide_sub;