JavaScript works on Safari 3 but not on newer versions

The following JavaScript is working fine in older versions of Safari (Safari 3), but not on latest version of Safari.

Can you help me find the problem?

function loadframe(){
  var iframeEl = document.getElementById("ifrm");
  if(!iframeEl)
  {
    window.alert('hellooooooo');
    var el = document.createElement("div");
    el.innerHTML = '<iframe id="ifrm" width="0" height="0" src=\'<!--EP CLASS="com.epiphany.presentation.ServerURLWriter" ACTION="campaign_segment_load" TE开发者_运维问答MPLATE="campaign\\campaign_segments" -->\' onload="dw_display(\'ifrm\',\'segmentspn\')" ></iframe>';
    document.body.appendChild(el);
    return true;
  }
  return false;
}

---

    function loadframe()
    {
       var iframeEl = document.getElementById("ifrm");
       if(!iframeEl)
       {
         var el = document.createElement('div');
         var e2 = document.createElement('iframe');
         e2.src ="http://google.com";
         e2.setAttribute('id',ifrm);
         e2.width= 80;      
         e2.height= 80;             
         document.body.appendChild(el);
         el.appendChild(e2);
         return true;
      }
      return false;
  }

This will work on all browser, As iframe is another element, we should add it using DOM's method.