I currently have a button like this, that takes a user to their 'mentions' page
<a href="http://my.url.org/mentions/<?php global $userdata; get_currentuserinfo(); echo( $userdata->user_login );?>">button</a>
What I'd like instead is that a user can see their 'mentions' when they log in to the page. so I'd like admin to be redirected to http://my.url.org/mentions/admin when he goes to a particular page (i.e. the homepage) - I think this would be best using a PHP redirect?
How could I do this?