var drtimeout         = 2;
var drclosetimer		= 0;
var drddmenuitem      = 0;

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

	// close old layer
	if(drddmenuitem) drddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	drddmenuitem = document.getElementById(id);
	drddmenuitem.style.visibility = 'visible';

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

// go close timer
function mclosetime()
{
	drclosetimer = window.setTimeout(mclose, drtimeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(drclosetimer)
	{
		window.clearTimeout(drclosetimer);
		drclosetimer = null;
	}
}

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