iframe自动适应内容的高度

<script>  
function autoResize()   
{   
try   
{   
document.all["inner"].style.height=inner.document.body.scrollHeight   
}   
catch(e){}   
}   
</script>  

<iframe name="inner" src="/ads/?ad=google&ad2=biz2008" marginwidth="0" marginheight="0" frameborder="0" scrolling="no" width="100%" style="height:expression(1); aho:expression(autoResize())"></iframe>