Click on button to pop up video

Hi everyone, my very first post here…

Im not very experienced with actionscript but I know the basics, so I was wondering if anyone could help me with this. Im making a game where the user has to click on a button which has a specific letter on it and the appropriate video will pop up on the same screen to show which letter that is. Could anyone please give me a hint on what code the button should have in order to find the appropriate video of that specific button. There will be 26 buttons and videos alltogether.

Thanks in advance, eugena