var hideDropdownMenuDelay = 100;
var bDropdownMenuVisible = false;

function rollover(oImg, strSrc, bOn )
{
	oImg.src= site_url+'lib/images/top_navbar/'+strSrc+(bOn?"_on":"_off")+".gif";
}
function showDropdownMenu(bShow)
{
	var oDiv;
	
	oDiv = document.getElementById("dropdownMenu");
	
	if(bShow)
	{
		bDropdownMenuVisible = true;
		oDiv.style.display = "block";
	}
	else
		if(!bDropdownMenuVisible)
			oDiv.style.display = "none";
	
}
function hideDropdownMenu()
{
	bDropdownMenuVisible = false;
	setTimeout("showDropdownMenu(false)", hideDropdownMenuDelay);
}