.button5 {
position: relative;
width: 23px;
overflow: hidden; //zoom:1;
background: red url(../img/button5.png) no-repeat left top;
margin: 5px 0 0;
height: 21px;
}

.button5 input { font-size: 40px; cursor: pointer; opacity:0; filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0); list-style: none; padding: 0; margin: 0;}