var timeout	= 250;
var closetimer	= 0;
var ddmenuitem	= 0;
var elementRollOn = new Array("-73px -89px","-213px -89px","-356px -89px");
var elementRollOff = new Array("-73px 0","-213px 0","-356px 0");
var rollelement
var rollelementid
// open hidden layer
function mopen(idnum, id, el)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	mclose();

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
	
	// position background image in css
	rollelement = document.getElementById(el)
	rollelementid = idnum
	rollelement.style.backgroundPosition = elementRollOn[rollelementid];
	

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	if(rollelement) rollelement.style.backgroundPosition = elementRollOff[rollelementid];
}

// 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;