function loadTab(){
   var getId=document.getElementById("cardBar").getElementsByTagName("li");
   var selectedItems=0;
   for(i=0;i<getId.length;i++){
       if (getId[i].className == "Selected"){
           selectedItems+=1;
       }
   }
   if (selectedItems==0){
       document.getElementById("cardBar").getElementsByTagName("li")[0].className="Selected";
       document.getElementById("Dcard1").style.display="block";
   }
}
window.onload=loadTab;
function switchTab(cardBar,cardId){
   var oItems = document.getElementById(cardBar).getElementsByTagName("li");   
   for (i=0;i<oItems.length;i++ ){
       var x=oItems[i];
       x.className="";
       var y=x.getElementsByTagName("a");
       y[0].style.color="#333";
   }
   document.getElementById(cardId).className="Selected";
   var dvs=document.getElementById("cardContent").getElementsByTagName("div");
   for (i=0;i<dvs.length;i++ ){
       if (dvs[i].id==("D"+cardId)){
           dvs[i].style.display="block";
       }else{
           dvs[i].style.display="none";
       }
   }
}