<input id=a size=20><input type=button value=选择文件 style="width:100;background-color:red" >
<div style="position:absolute;top:15;left:-80;width:150;filter:alpha(opacity=0)" >
<input type="file" onpropertychange="a.value=this.value" size=33></div>
<div style="position:absolute;top:15;left:-80;width:150;filter:alpha(opacity=0)" >
<input type="file" onpropertychange="a.value=this.value" size=33></div>
<img src="http://community.csdn.net/images/top1.gif" onclick="document.getElementById('myfile').click();"/>