function activate_tab(selected_tab) {
   var tab_list = "<ul class='tabs'>";
   
   if (selected_tab == "live") {
      tab_list +=    "   <li class='selected'><a href='#'>Live Events</a></li>";
      loadXMLDoc('xml/live.xml');
   }
   else
      tab_list += "   <li><a href='#' onclick=\"activate_tab('live')\">Live Events</a></li>";

   if (selected_tab == "archive") {
      tab_list += "   <li class='selected'><a href='#'>Archive</a></li>";
      loadXMLDoc('xml/tvp.xml');
   }
   else
      tab_list += "   <li><a href='#' onclick=\"activate_tab('archive')\">Archive</a></li>";
      
   tab_list +=    "</ul>";
   
   getObj('playlist_tabs').innerHTML=tab_list;
}

function getObj(obj) {
    return (document.getElementById&&!document.all) ? document.getElementById(obj) : document.all[obj];
}