[kh99]

You'd need to write some javascript to do that. What you put for onclick has to be javascript code that will run in the user's browser, not a php function.

You could do what you want to do by having javascript to hide and show (or gray out) the time row depending on the state of the radio buttons. I know the notice manager grays out the options that don't have the checkbox checked, so you might look in notice.php to see how that's done.