var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;
var myX;

// open hidden layer
function mopen(id,offset)
{	
	// cancel close timer
	mcancelclosetime();
	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	
	// close old layer if site is opened for the first time
	activeMenu = document.getElementById('active_menu');
	if(activeMenu) { 
		activeNodes = activeMenu.childNodes;
		if(activeNodes) {
			for(var i in activeNodes) {
				if((activeNodes[i] == '[object HTMLDivElement]') || (activeNodes[i] == '[object]')) { 
				   activeNodes[i].style.visibility = 'hidden';
				}
			}
		}
	}
	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	if(ddmenuitem)	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;