Image reversion

i don’t know if I said it correctly, but i want to reverse an image. I mean, if i have a movie clip like a car. It has a front and a back. If i move to the right, then it is like this:

back of a car–car–front of a car

And if i move to the left it is like:

front of a car–car–back of a car

And i don’t know how to do such an image reversion. I could have 2 images of it in the library and then depending on the left or right button pressed, change the image, but it would be a mess i think so, any other ideas would be helpful.