textarea自适应高度

<script type="text/javascript"><!--
google_ad_client = "pub-4490194096475053";
/* 内容页,300x250,第一屏 */
google_ad_slot = "3685991503";
google_ad_width = 300;
google_ad_height = 250;
//-->
</script><script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript">
</script>
<!--textarea自适应高度--> <h3>textarea自适应高度</h3> <textarea style='border: 1px solid #94BBE2;width:100%;' rows=15 onpropertychange='this.style.posHeight=this.scrollHeight' id=textarea onfocus='textarea.style.posHeight=this.scrollHeight'> <br> <Br> </textarea>

http://www.corange.cn/archives/2008/06/1272.html