// Copyright 2006-2007 javascript-array.com
var timeout	= 500;
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;