Validation message choice triggering script

[Sinky]

Hi people!

I have a field which validation is set to Always, Allow user to override during data entry unchecked, unique value, custom message checked.

When validation fails the message box offers two options: revert record and OK.

Is there a way to trigger particular script if I choose OK?

or is there a way to get the message with only one option (revert record) to choose?

Much obliged!