用iframe自动适应高度

很多做网站的人都用过IFrame，也常希望能让IFrame自动改变大小，以美化全局效果。以下是两种方法
方法一：(较通用）
<script language="Javascript">
var getFFVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Firefox")).split("/")[1]
//extra height in px to add to iframe in FireFox 1.0+ browsers
var FFextraHeight=getFFVersion>=0.1? 16 : 0

function dyniframesize(iframename) {
var pTar = null;
if (document.getElementById){
pTar = document.getElementById(iframename);
}
else{
eval('pTar = ' + iframename + ';');
}
if (pTar && !window.opera){
//begin resizing iframe
pTar.style.display="block"

if (pTar.contentDocument && pTar.contentDocument.body.offsetHeight){
//ns6 syntax
pTar.height = pTar.contentDocument.body.offsetHeight+FFextraHeight;
}
else if (pTar.Document && pTar.Document.body.scrollHeight){
//ie5+ syntax
pTar.height = pTar.Document.body.scrollHeight;
}
}
}
</script>

<iframe id="myTestFrameID"
onload="javascript：{dyniframesize('myTestFrameID');}"
marginwidth=0 marginheight=0 frameborder=0
scrolling=no src="http://www.cyhd.net/myiframesrc.php"
width=200 height=100></iframe><script language="Javascript">
var getFFVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Firefox")).split("/")[1]
//extra height in px to add to iframe in FireFox 1.0+ browsers
var FFextraHeight=getFFVersion>=0.1? 16 : 0

function dyniframesize(iframename) {
var pTar = null;
if (document.getElementById){
pTar = document.getElementById(iframename);
}
else{
eval('pTar = ' + iframename + ';');
}
if (pTar && !window.opera){
//begin resizing iframe
pTar.style.display="block"

if (pTar.contentDocument && pTar.contentDocument.body.offsetHeight){
//ns6 syntax
pTar.height = pTar.contentDocument.body.offsetHeight+FFextraHeight;
}
else if (pTar.Document && pTar.Document.body.scrollHeight){
//ie5+ syntax
pTar.height = pTar.Document.body.scrollHeight;
}
}
}
</script>

<iframe id="myTestFrameID"
onload="javascript：{dyniframesize('myTestFrameID');}"
marginwidth=0 marginheight=0 frameborder=0
scrolling=no src="http://www.cyhd.net/myiframesrc.php"
width=200 height=100></iframe>

方法二：（较简便）
<IFRAME id=headlogin marginWidth=0 marginHeight=0 src="http://www.cyhd.net/News/2007-12/xxx/" frameBorder=0 width=100% scrolling=no height=25 onload="this.height=this.contentWindow.document.body.scrollHeight"></IFRAME>