Different text in frames

I’ve created a dynamic scrolling text box using the kirupa tutorial. It’s the tutorial that uses self-made buttons to scroll up and down. In my movie I’ve got 7 buttons, when one is pressed I want to display different text in the text box. I have it working by loading text from .txt files but it is slow and does not allow me to format the text as I would like. What I’m thinking of doing is creating 7 keyframes on the timeline of the scrollable text. Then in each frame have the different text that I want displayed. When I click on a button it would go to one of those frames thus displaying the corresponding text. I can’t get it to work. I’ve changed the text box to a static text box. I can’t get it to move the playhead to the next frame in the text movie clip which the scrollable text box resides in. Is it possible to do this?