iframe实现自适应高度

<script type ="text/javascript" language ="javascript" >

<!--

function TuneHeight(fm_name,fm_id){

var frm=document.getElementById(fm_id);

var subWeb=document.frames?document.frames[fm_name].document:frm.contentDocument;

if (frm != null && subWeb != null){

frm.style.height = subWeb.documentElement.scrollHeight+ "px" ;

//如需自适应宽高，去除下行的“//”注释即可

// frm.style.width = subWeb.documentElement.scrollWidth+"px";

}

}

//-->

</script>

<iframe

onLoad ="{TuneHeight('FM_Name','FM_Id');}"

src ="http://www.3netgo.com" name ="FM_Name"

id ="FM_Id" width ="800" marginwidth ="0"

marginheight ="0"

frameborder ="0" scrolling ="no" >

</iframe>