CSS美化 input type=file 兼容各个浏览器

<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:0;padding:0;}
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./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;
: 0;
left: 0;
width: 140px;
height: 39px;
font-size: 100px; / 增大不同浏览器的可点击区域 /
opacity: 0; / 实现的关键点 /
filter:alpha(opacity=0);/ 兼容IE /
}