Multiple File Selection in File Upload Box

[centerwork]

How can I make the form below select multiple files without coping the <input> tag over and over again?

 

Or if you can recommend a tutorial or something?

 

<form action="" method="post" enctype="multipart/form-data">
<p>Pictures:
<input type="file" name="pictures[]" />
<input type="submit" value="Send" />
</p>
</form>