var timeout         = 600;
var closetimer		= 0;
var ddmenuitem      = 0;

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer "if ddmenuitem already initialized"
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it "itializes on first pass"
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer "activate the timer"
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer when hover over the menu or menu tree
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose;