<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<style type="text/css">
.input_text{width:250px;}
.input_file{width:300px; margin-left:-300px; filter:alpha(opacity=0); opacity:0;}
</style>
html部分：
<body>
<form method="post">
<input class="input_text" type="text" id="txt" name="txt" />
<input type="button" value="浏览" />
<input class="input_file" size="30" type="file" onchange="txt.value=this.value" />
</form>
</body>
原文：http://www.cnblogs.com/jar-gon/p/6688284.html