IE隐藏 file 上传样式

.file{ width: 82px;  height: 32px; background: #333;  margin: 0 auto;position: absolute;  top: 126px;
    left: 0px;  opacity: 0; filter:alpha(opacity=0); -moz-opacity:0; -khtml-opacity:0;
     z-index: 2;}