var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;
 
// open hidden layer
function mopen(id)
{	
	if(ddmenuitem == null)
		return;
	try{
		// 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';
	}
	catch(ex){}
 
}
// close showed layer
function mclose()
{
	if(ddmenuitem == null)
		return;
	try{
		if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	}
	catch(ex){}
}
 
// go close timer
function mclosetime()
{
	if(ddmenuitem == null)
	return;
	try{
		closetimer = window.setTimeout(mclose, timeout);
	}
	catch(ex){}
}
 
// cancel close timer
function mcancelclosetime()
{
	if(ddmenuitem == null)
		return;
	try{
		if(closetimer)
		{
			window.clearTimeout(closetimer);
			closetimer = null;
		}
	}
	catch(ex){}
}
 
// close layer when click-out
document.onclick = mclose;