<FORM>

        <A class=btn_addPic href="javascript:void(0);"><SPAN><EM>+</EM>添加图片</SPAN>

        <INPUT class=filePrew title=支持jpg、jpeg、gif、png格式，文件小于5M tabIndex=3 type=file size=3 name=pic></A>

    </FORM>

 *{margin:;padding:;}

a{text-decoration:none;}

.btn_addPic{

display: block;

position: relative;

width: 140px;

height: 39px;

overflow: hidden;

border: 1px solid #EBEBEB;

background: none repeat scroll 0 0 #F3F3F3;

color: #999999;

cursor: pointer;

text-align: center;

}

.btn_addPic span{display: block;line-height: 39px;}

.btn_addPic em {

background:url(http://p7.qhimg.com/t014ce592c1a0b2d489.png) 0 0;

display: inline-block;

width: 18px;

height: 18px;

overflow: hidden;

margin: 10px 5px 10px 0;

line-height: 20em;

vertical-align: middle;

}

.btn_addPic:hover em{background-position:-19px 0;}

.filePrew {

display: block;

position: absolute;

top:;

left:;

width: 140px;

height: 39px;

font-size: 100px; /* 增大不同浏览器的可点击区域 */

opacity:; /* 实现的关键点 */

filter:alpha(opacity=0);/* 兼容IE */

}