function navs(thisObj,Num)
{
if(thisObj.className == "activenav")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 = "activenav";
   
  }else{
   tabList[i].className = "normalnav"; 
  }
} 
}