// javascript document
function ntabs(thisobj,num){
if(thisobj.classname == "active")return;
var tabobj = thisobj.parentnode.id;
var tablist = document.getelementbyid(tabobj).getelementsbytagname("li");
for(i=1; i <=tablist.length; i++)
{
  if (i == num)
  {
   thisobj.classname = "active"; 
      document.getelementbyid(tabobj+"_content"+i).style.display = "block";
  }else{
   tablist[i-1].classname = "normal"; 
   document.getelementbyid(tabobj+"_content"+i).style.display = "none";
  }
} 
}