Showing an HTML page after association

[graffitici at yahoo.com]

Hi all, 

I have a question that may have come up before (if so, sorry, I couldn't 
find it). I currently use hostapd to open up a non-secured AP. Once 
connected, the users have to create credentials through an http form 
running on the AP. 

In the current setup, the user has to open the browser and navigate to 
the AP's IP to get to the form. Is there a way to show the form right 
upon connection, the way hotels and hotspots show license agreements 
etc? How can I configure such a system? 

Thanks a lot! 
?Berk