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


function menuOpen(id)
{	
menuResetTimer();

if(ddmenuitem){ ddmenuitem.style.visibility = 'hidden'; }
if(ddmenuarrow){ ddmenuarrow.src = 'multimedia/images/shell/topNavArrowBlank.png';}

ddmenuarrow = document.images['arrow_' + id];
if(ddmenuarrow){
	if(id == "n2" || id == "n3" || id == "n4" || id == "n5"){
		ddmenuarrow.src = 'multimedia/images/shell/topNavArrowDown.png';
	}else{
		ddmenuarrow.src='multimedia/images/shell/topNavArrow.png';
	}
}

ddmenuitem = document.getElementById(id);
if(ddmenuitem){ ddmenuitem.style.visibility = 'visible'; }
}

function menuClose()
{
if(ddmenuitem)
 ddmenuitem.style.visibility = 'hidden';
if(ddmenuarrow)
 ddmenuarrow.src = 'multimedia/images/shell/topNavArrowBlank.png';
}

function menuKillTimer()
{
closetimer = window.setTimeout(menuClose, timeout);
}

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

document.onclick = menuClose;