下面的为何不生效？

[ttc888]

<style type="text/css">
<!--
.ToAlpha{filter:alpha(opacity=80)}
-->
</style>
<IMG onmouseover="this.style.filter=''" class="ToAlpha" onmouseout="this.className='ToAlpha'"
src="images/test.gif" border=0>

[孟子E章]

<style type="text/css">
<!--
.ToAlpha{filter:alpha(opacity=80)}
-->
</style>
<IMG onmouseover="this.style.filter=''" class="ToAlpha" onmouseout="this.style.filter='alpha(opacity=80)'"
src="http://community.csdn.net/ADV/Images/banner100x300.GIF" border=0>

[ttc888]

呵呵，上面这种方法我也知道。
onmouseout能否改变为某个CLASS NAME的呢？

[matrixy]

可以。

onmouseover="className='newclss'"