First, I want to thanks to those that take time to answer and help. I solved the problem of my shivering images, setting the fps to 30. Now, if someone can help me with this: I need to make a sequence of images (6) flow along the screen continuously. I don't know how to join the last image with the first as a non stop smoothy loop. I know there is a way using the action-scrip window, but I don't remember much because I have not been using this app much lately. Thank you.
Place the images in separate layers
Then you take the half part of the last image animation to the starting of frame
Or placing the half part of the first animation to the last frames
Thank you webqaflash.