用css filter做鼠标滑过图片效果

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*{ margin:0; padding:0;}
body{ margin:0 auto; font-size:12px;}
.model{margin:0 auto; width:30px;}
.model a:hover{ text-decoration:none;}
.model a img{ border:#fff 1px solid;}
.model a:hover img{ border:#888 1px dotted;}
.model a span{ padding:0; display:block; width:80px; height:50px; margin-top:-32px; overflow:hidden; line-height:14px; filter: Alpha(opacity=0); opacity:.0; cursor:pointer; text-align:center;}