Prevent focus via keyboard

I have a form consisting of a series of input text boxes and a couple other labels that are movie clips (with onRelease defined on 'em) . Using the tab key to move to the next text box works right up to the last field ... one of the label clips is getting focus (yellow bounding box) instead of the last text box.

What's the easiest way to handle this? my pov i should be able to insert a command in the label clip that prevents the tab key from giving it focus yet still allow a mouse to click it.