<style>
.over{background:url(1.gif);}
.out{background:url(2.gif);}
</style><td class="out" onmouseover="this.className='over'" onmouseout="this.className='out'">
.over{background:url(1.gif);}
.out{background:url(2.gif);}
</style><td class="out" onmouseover="this.className='over'" onmouseout="this.className='out'">
.over{background:url(1.gif);}
.out{background:url(2.gif);}
</style><td class="out" onmouseover="this.className='over'" onmouseout="this.className='out'">这种在鼠标移到第一个单元格时,下头的单元格的背景图为何都无法显示了
只有点鼠标先移到后头的单元格时,才正常