function showMenu(menuId, element)
{
	var menu = document.getElementById(menuId + "MenuDiv");

	if (element)
	{
		menu.style.left = element.offsetLeft + Math.round((element.offsetWidth - menu.offsetWidth) / 2) + "px";
		menu.style.top = (element.offsetTop + element.offsetHeight) + "px";
	}
	menu.style.visibility = "visible";
}

function hideMenu(menuId)
{
	document.getElementById(menuId + "MenuDiv").style.visibility = "hidden";
}