Hi BekkusU!
To animate any elements in the game, you must do it frame by frame. Which means if you're using any .gif files, convert all the frames captured into .png file one by one.
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For the back button:
"menu-back-n"; n=0, 1, 2, 3...
The first frame is set to 0, then the next one is 1, and so on.
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For the scorebar:
"scorebar-colour-n"; n=0, 1, 2, 3...
Same here, the first frame is set to 0, then 1, and so on.
Also, keep in mind that you can only animate the layer of the scorebar, scorebar background cannot be animated.