function roll(home, home_src, about, about_src, artists, artists_src, shop, shop_src, gallery, gallery_src)
	{
	document.images[home].src = home_src;
	document.images[about].src = about_src; return true;
	document.images[artists].src = artists_src; 
	document.images[shop].src = shop_src; return true;
	document.images[gallery].src = gallery_src;
	}
	
var timeout	= 400;
var closetimer	= 0;
var ddmenuitem	= 0;

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

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

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

}
// 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;