function showcontent(alink)
{
	var ulid=alink.parentNode.parentNode.id
	var ullist = document.getElementById(ulid).getElementsByTagName("li");
	var getrel = alink.rel;
	for(i=0;i<ullist.length;i++)
	{
		ullist[i].className="";
		document.getElementById(ullist[i].childNodes[0].rel).style.display="none";
	}
	alink.parentNode.className="active";
	document.getElementById(getrel).style.display="block";
	return false;
}

function starttabs()
{
	var ulobj = document.getElementById("tabnav");
	var ullist = ulobj.getElementsByTagName("li")

	for(i=0; i<ullist.length;i++){
		var ulink= ullist[i].getElementsByTagName("a")[0]

		ulink.onclick= function()	{
			showcontent(this)
			return false;
			
		}
	}
}