function findPos(obj)
{
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}

var can_hide = new Array();
var delay=1000;

function showmenu(num)
{
	var linkobj = document.getElementById('link'+num);
	var menuobj = document.getElementById('nav'+num);
	linkobj.style.font = 'bold 13px/15px arial';
	position = findPos(linkobj);
	menuobj.style.left = (position[0]+10)+'px';
	menuobj.style.top = (position[1]+17)+'px';
	menuobj.style.display = 'block';
	can_hide[num] = false;
}
function showNav(navID, is_show)
{
	if (is_show){
		can_hide[navID] = false;
	}else{
		can_hide[navID] = true;
		setTimeout('hideNav(\''+navID+'\')',delay);
	}
}
function hideNav(num)
{
	navObj=document.getElementById('nav'+num);
	if(can_hide[num])
	{
		var linkobj = document.getElementById('link'+num);
		navObj.style.display='none';
		if(linkobj.className != 'sel')linkobj.style.font = '13px/15px arial';
	}
}