var timeout	= 350;
var closetimer	= 0;
var ddmenuitem	= 0;
var naviItem    = '';
var lastNaviItem = '';

function openItem(id, type)
{	
	
	cancelItemCloseTime();

	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
	
	if(lastNaviItem != '') lastNaviItem.style.backgroundPosition = 'top';
	
	naviItem = document.getElementById(type);
	naviItem.style.backgroundPosition = 'bottom';
	
	lastNaviItem = naviItem;

}

function itemClose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	
	naviItem.style.backgroundPosition = 'top';
}


function itemCloseTime()
{
	closetimer = window.setTimeout(itemClose, timeout);
}


function cancelItemCloseTime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}