代码如下:

<style type=\'text/css\'>
/*透明20%*/
.opacity-20 {
filter:alpha(opacity=20); /*支持IE浏览器的filter*/
-webkit-filter:opacity(0.2); /*支持chrome浏览器filter*/
}
/*不透明*/
.opacity-100 {
filter:alpha(opacity=100);
-webkit-filter:opacity(1);
}
</style>
<script language=\"javascript\">
function makevisible(cur,which){
//交替设置不带透明度和带透明度的css
//完成鼠标移进图片则不透明显示，鼠标移出则带透明度显示
if (which==0) {
cur.className = \'opacity-100\';
}else{
cur.className = \'opacity-20\';
}
}
</script>
<img src=\"final.bmp\" border=1 onMouseOver=\"makevisible(this,0)\" onMouseOut=\"makevisible(this,1)\" alt=\"\">