function   nTabs(thisObj,Num){ 
if(thisObj.className == "active")return; 
var tabObj = thisObj.parentNode.id; 
var tabList = document.getElementById(tabObj).getElementsByTagName("li"); 
for(i=0; i <tabList.length; i++) 
{ 
  if (i == Num) 
  { 
   thisObj.className = "active";  
      document.getElementById(tabObj+"_Content"+i).style.display = "block"; 
  }else{ 
   tabList[i].className = "normal";  
   document.getElementById(tabObj+"_Content"+i).style.display = "none"; 
  } 
}  
} 