Checkboxes, Strings and Arrays.

Hi,

I'm stuck. I have three groups of varying numbers of checkboxes on a form where the user can select 6 out of each group. Each checkbox represents a string value and I plan to pass the string variable corresponding to the user's selection into a fixed size array for use later on in my code. As one checkbox is ticked, the corresponding variable should be passed to the first empty index in the array. As a checkbox is in-ticked, the associated array index is to be cleared and the user's next selection would fill that gap.

Not a clue how to go about this though!

Any suggestions would be massively appreciated.