iframe自适应高度

<script language="JavaScript" type="text/JavaScript"> 
<!-- 
function autoResize() 
{ 
 try 
 { 
 document.all["iframe1"].style.height=iframe1.document.body.scrollHeight 
 } 
 catch(e){} 
} 
</script> 

 

<IFRAME name=iframe1 id=iframe1 src="test.htm" frameborder="NO" border="0" framespacing="0" width="100%" style="height:expression(1);aho:expression(autoResize())"></IFRAME>