override create form using activescaffold plugin to build image upload technique

does anyone have ever used activescaffold to build image upload to database? i'm not sure how to override the form elements in activescaffold plugin ( good UI rendering for LCRUD) and its difficult for me to understand where exactly the override technique should be adopted and how entry screen to be overrided to add image file upload to DB?>

pls help with some example using activescaffold.

thanks (Selvan) Kalaiselvan