JScript Smart Table

I have an application where I have 9 items to choose from and desire a table that will allow only 3 items (any 3 items) to be chosen then check out of the table.Check out can not be allowed unless only 3 items are selected.
Is the JScript applications somewhere that will perform this logic?
Many thanks.
Sincerely,
Tim

More and clearer details, please. I don't quite understand. Maybe a little bit of your HTML code and ... have you tried some javascript solutions so far?

http://www.codingforums.com/showthread.php?t=85884