var JSB={};
      JSB.addOnload = function(newFuc){            
        var oldFuc=window.onload;
        if(typeof oldFuc=='function'){
            window.onload=function(){
               if(oldFuc)
                   oldFuc();
                newFuc();
            }
        }
        else{         
          window.onload=newFuc;
        }

    }