Iframe自适应高度兼容ie,firefox多浏览器

<script type="text/javascript">
 function setcwinheight(){
  var bobo=document.getelementbyid("bobo"); //iframe id
  if (document.getelementbyid){
   if (bobo && !window.opera){
    if (bobo.contentdocument && bobo.contentdocument.body.offsetheight){
     bobo.height = bobo.contentdocument.body.offsetheight;
    }else if(bobo.document && bobo.document.body.scrollheight){
     bobo.height = bobo.document.body.scrollheight;
    }
   }
  }
 }
</script>
<iframe width="100%" id="bobo" onload="javascript:setcwinheight()" height="1" frameborder="0" src="/default.asp?cateid=1"></iframe>

<iframe width="100%" id="bobo" onload="javascript:setcwinheight()" height="1" frameborder="0" src="/default.asp?cateid=1"></iframe>
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]