// 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;