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+"_cont"+i).style.display = "block";  
          }
          else{  
            tabList[i].className = "normal";  
            document.getElementById(tabObj+"_cont"+i).style.display = "none";  
        }  
      }  
    }  

$(document).ready(function(){

  var $tab_li = $('.tab ul li');

  $tab_li.hover(function(){

    $(this).addClass('selected').siblings().removeClass('selected');

    var index = $tab_li.index(this);

    $('div.tab_box > div').eq(index).show().siblings().hide();

  });  

});