Stage problems

I am relativly new to flash and I am encountering a problem which is probably elementry to you. I have a strip of pictures running off my stage. I am going to have them slide across the page like a film strip. The problem is the strip is so long it runs past the borders shown beyond the stage. When the movie plays the images beyond the borders show up as scrambled lines. Do you know what a possible solution is for this?
I am using this code to movie the movie clip. The last few pictures are the ones scrambled.

onClipEvent(enterFrame) {
speed = 1;
this._x += speed;
}

if you can shed any light on my problem it would be appretiated.
Andrew Miller