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


// open hidden layer
function mopen(id)
{	
	// cancel close timer
	id2 = "m" + id
	mcancelclosetime();

	// close old layer
	if(ddmenuhead){
		if(ddmenuhead.style.backgroundImage != "url(/objects/images/nav_active.jpg)")
			ddmenuhead.style.backgroundImage = "url('/objects/images/nav_bg.jpg')";
	}
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	
	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuhead = document.getElementById(id2);

	if(ddmenuhead.style.backgroundImage != "url(/objects/images/nav_active.jpg)")
		ddmenuhead.style.backgroundImage = "url('/objects/images/nav_hover.jpg')";
	
	if(ddmenuitem != null)
		ddmenuitem.style.visibility = 'visible';
}
// close showed layer
function mclose()
{
	if(ddmenuhead) {
		if(ddmenuhead.style.backgroundImage != "url(/objects/images/nav_active.jpg)"){
			ddmenuhead.style.backgroundImage = "url('/objects/images/nav_bg.jpg')";}
	}
	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;