function showLevel2(event)
{
	var level1Element = event;
	var level2ElementId = level1Element.id + "_level2";
	var level2Element = getElement(level2ElementId);
	var level1ImageId = level1Element.id + "_img";
	var level1Image = getElement(level1ImageId);

	if (level2Element.style.display != "block")
	{
		level2Element.style.display = "block";
		level1Image.src="../images/menu_opened.gif";
	}
	else
	{
		level2Element.style.display = "none";
		level1Image.src="../images/menu_closed.gif";
	}
}

function gotoURL(a_url)
{
	//window.top.location.replace(a_url);
	var	documentFrame = getTopElement("MainFrame");

	documentFrame.src = "./htmls/" +  a_url;
}

function getElement(aID)
{
     return (document.getElementById) ? document.getElementById(aID) : document.all[aID];
}

function getTopElement(aID)
{
     return (document.getElementById) ? top.document.getElementById(aID) : top.document.all[aID];
}