resetTabs = function()
{
  var tabs = document.getElementsByClassName("tab");
  for (var i = 0, tab; tab = tabs[i]; i++) 
    {
      tab.style.display="none";
      tab.parentNode.className="";
    }
  var tabs = document.getElementById("tabnavigation");
  var items = tabs.getElementsByTagName("li");
  for (var i = 0, item; item = items[i]; i++) 
    {
      item.className="";
    }
}
  
  initTabs = function()
{
  resetTabs();
  var tabs = document.getElementById("tabnavigation");
  var items = tabs.getElementsByTagName("li");
  for (var i = 0, item; item = items[i]; i++) {
      for (var j = 0, n; n = item.childNodes[j]; j++)
	if (n.nodeName=="A")
	  link = n;
      
      target = link.href.substring(link.href.indexOf("#")+1);
      link.setAttribute("rel",target);
      link.onclick = function(target)  { 
	resetTabs();
	document.getElementById(this.getAttribute("rel")).style.display="block"; 
	this.parentNode.className="over";
	return false;
      }
    }    
  items[0].className="over";
  var tabitems = document.getElementsByClassName("tab");
  tabitems[0].style.display="block";

}    
    addEvent(window,"load",initTabs);