function getObj(id) { return document.getElementById(id); }
function addLoadEvent(func){
 var oldonload = window.onload;
 if (typeof window.onload != 'function') {
  window.onload = func;
 } else {
  window.onload = function(){
   oldonload();
   func();
  }
 }
}
function addBtn() {
 if(!getObj('ibanner')||!getObj('ibanner_pic')) return;
 var picList = getObj('ibanner_pic').getElementsByTagName('a');