hallo...this is my first post..

i want to validation my registration..
if there are anyone to regis but the username is already(in database), there are message " sorry, choose the different name please"

i have no idea, i have tried but always failed...

o..yeah i use ms.accsess for my database..and JSP ( not jsp 2 or something like that)
help me please...
i'm so poor in jsp & access ( newbie)

and please tell me where the false from my script..
sorry bad english...