Buttons?

how do i make a button…so that a certain times its not clickable, when ever i try to change the actions of a button…it changes the actions for it through out the whole movie, i just want it to be not usable for a short second.

I hope you understand

http://keiaston.pwp.blueyonder.co.uk/

the buttons on the left and right…need to be unusable just at the end of the movie, which i can do, but it makes them useable all thorough the movie…

please help