CSS美化 input type=file 兼容各个浏览器（转）

HTML代码：

    <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>

CSS

 *{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.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: 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 */ 
} 

显示结果：

博客内容摘自：http://www.jb51.net/css/69093.html