Plugin to capitalize username on registration

[malmazan]

Hi all:

I'm after a plugin that capitalizes the username on registration, as I require name and last name.

This is what I have:

$username = ucwords(strtolower($this->fetch_field('username')));
$username_raw = $username;
vB_Template::preRegister('register',array('username_raw' => $username_raw));

assingned to userdata_presave

but it does not work.

I would be very grateful for some help