Cross fading effect from last frame to first frame

Hello !
I have 4 pics cross fading.Each pic distributed on 4 layers.
For example, image 2 starts fading in, 10 frames before image 1 fades out.
How can I keep this cross fading between the last frame of my scene and its first frame ?
A simple gotoandplay(1) does not give me the expected result.The cross fading effect is lost.
Thank you !