function setActiveClass(li)
   {
         li.className = "active";
   }
   function clearActiveClass(li)
   {
         document.getElementById(li).className = "";
   }
   function showTab(tabName)
   {
       var tab = document.getElementById(tabName);
       
       tab.style.display = "inline";
   }
   function hideTab(tabName)
   {
       var tab = document.getElementById(tabName);
       
       tab.style.display = "none";
   }