<script>

      function resize()
      {
          if(document.all)
          {
          parent.document.all("ifrm").style.height=document.body.scrollHeight;
          parent.document.all("ifrm").style.width=document.body.scrollWidth;
          }
          
      }
      setTimeout("resize()",1000);//延时起到很好的效果

      </script>

http://www.0722pc.com  查看效果