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

// open hidden layer
function mopen(id, w)
{	
	
	left = (136 - w)/2;
	
	mcancelclosetime();

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

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
	ddmenuitem.style.marginLeft = '-'+left+'px';

}
// 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;