var currentTab = "1";

function changeTab(tabname)
{
	document.getElementById("content"+currentTab).style.visibility = "hidden";
	document.getElementById("content"+tabname).style.visibility = "visible";
	var left = document.getElementById("tab"+tabname).style.left;
	var width = document.getElementById("tab"+tabname).style.width;
	document.getElementById("activeTab").style.left = (left.substr(0,left.length-2) - 0 + 24) + "px";
	document.getElementById("activeTab").style.width = (width.substr(0,width.length-2) - 12) + "px";
	currentTab = tabname;
}