If you dont want the uploader to login, then you can just create a few select boxes, which consist of the available directories, say one holding:
Code:
...
<select name="user">
<option value="John">John</option>
<option value="Karen">Karen</option>
<option value="Brian">Brian</option>
</select>
...
<select name="event">
<option value="Party">Party</option>
<option value="Relaxation">Relaxation</option>
<option value="Misc">Misc</option>
...
Then in your upload script you'd make it
PHP Code:
$target_file_path = "c:\\Server\\upload\\" . $_POST['user'] . "\\" . $_POST['event'] . "\\" . $file_name;