Button and Movie clip help please

I am new to action scripting and am in need of some help.

I have a movie clip which is to act as the menu to my site and within this movie clip there are 5 buttons that I want to use to move to different pages. My problem is that i cannot figure out how to get the buttons to navigate to the main timeline. i.e. when a button is clicked I want the play head to move to say frame 25 on Scene 1.

Please if anyone knows how to get buttons within movie clips to effect the main timeline. I have spent 2 days looking over different forums and sources to try and find the solution but to no luck. I am using CS4 so its actionscript 3.0.
Any help would be greatly appreciated.

Heres the file .