If you have a stop() at the end of each page (in this case a video) then you should expect it to stop. Don't use a stop(), and it won't stop..
What I presume is you have your video embedded in a MovieClip in your library. You stuck that clip on a single frame and let it play. If that's the case when the video is complete the clip needs to tell its "parent" to play.
So if that's the case, add a layer to the top of the video and on the last frame add a keyframe with this script:
Well my imported video is on a keyframe and I havent converted it to symbol like movieclip or so i have added the coding like you have said and i get this error.
TypeError: Error #1034: Type Coercion failed: cannot convert flash.display::Stage@34d26f99 to flash.display.MovieClip.
Maybe I jujst did something stupid, sorry im still new in flash.
Explain to me the process you used to import the video. You can do it multiple ways and the way you choose to import it makes the difference.
I presumed you imported it "into a movieclip". If that's so then you'd have a library item and if you double click to view its contents you would see your video take up as many frames as it needs along the timeline. Is this the case? If so then this is where you'd do what I mentioned above.
If you imported your video directly to the timeline without putting it in a movieclip (which is an option during import) then that's different. Let me know how you imported it or post a screenshot of your timeline.