Actionscript singular button navigation to multiple places in timeline?

I have a navigation menu that is a movieclip (menu_mc). In the movieclip are 5 buttons. i need the buttons, when clicked, to play a different area of the timeline, dependent on where the user is on the timeline.

I’ve tried writing this actionscript on the main timeline. But can’t get anything to work and am a little lost. for example—

Say the viewer is on frame 5, and clicks the “blue” button and jumps to frame 6. on frame 6 if they are to click “blue” button again i want to send them to frame 7, not to frame 6.

if anyone could direct me to a tutorial on how to write up something like this, especially one dealing with a very large timeline and multiple buttons, i’d be grateful!