Checkbox half working

[Milfredo]

Thank You. I posted just the one checkbox. I have up to 25 checkboxes. I wanted the user to be able to uncheck a horse if he checked it by mistake. I think I under stand the need for a second ;ist of checked status. Cause after the scratches are done, I have to use horses data to create race factors to ultimately get final ratings. I suppose I would then use the scratched list to check to see if horse is running or not before I create the ratings.