CSS 实现DIV浮动定位不闪

HTML:

<div id="note">
	Hello world!
</div>

CSS:

<style>
#note{width: 480px;position: fixed;bottom:0;right: 0;
/* for ie6 */
_position:absolute;_top: expression(documentelement.scrolltop + documentelement.clientheight-this.offsetheight);}
</style>