I just performed a search for the user noODle ,
Once i performed the search by pointing my mouse to the 'search' button and clicking it i got redirected to the following page:
http://www.antionline.com/websearch....hButton=Search

Right-side of the screen, 'search by user name', click search button (note that this only happens when clicking the search button and not if you press enter after you filled in the username you want to search by).

Cheers

<edit> slackware 10.1
Firefox 1.0.2