【input】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.7.1.js'></script>
<style type='text/css'>
input {
display: block;
visibility: hidden;
width: 0;
height: 0;
}
</style>
<script type='text/javascript'>
$(window).load(function(){
$('button').click(function(){
$('input').click();
});
});
</script>
</head>
<body>
<input type="file" name="somename" size="chars">
<button>Choose File</button>
</body>
</html>
