function showtab(dest, src1, src2)
{
	function getContentObj(sId)
	{
		var oContent = null;
		var aId = sId.split("_");
		if(aId.length == 2)
		{
			oContent = document.getElementById("content_" + aId[1]);
		}
		return oContent;
	}
	function setContentHidden(sId)
	{
		var oTab = document.getElementById(sId);
		if(oTab)
		{
			oTab.className = "";
			var oContent = getContentObj(sId);
				oContent.style.display = "none";
		}
	}
	function showDelayImg(oParent)
	{
		var oImgs = oParent.getElementsByTagName("IMG");
		if(oImgs)
		{
			for(var i = 0;i < oImgs.length;i++)
			{			
				var imgurl = oImgs[i].getAttribute("imgurl");
				if(imgurl && oImgs[i].src != imgurl)
				{	
					oImgs[i].src = imgurl;
				}
			}
		}
	}
	var oDest = document.getElementById(dest);
	if(oDest)
	{
		var oDestContent = getContentObj(dest);
		if(oDestContent)
		{
			showDelayImg(oDestContent);
			setContentHidden(src1);
			setContentHidden(src2);
			oDestContent.style.display = "";
			oDest.className = "selected";
		}
	}
}