Looping a Flash 8 video

I work for a digital advertising company that designs taxi top signs with 32" LCD displays, that play flash ads. I have my flash videos loop through the vid player I am using but I would like to have the video loop within its own flash instead of re-uploading the file every time. The flash files I receive are in .SWF form. I have put them back into their .FLA form but there is very little action script for the video and I am unclear on how to get the video to loop. Can someone explain to me the action script or procedure necessary to make the entire video loop each time? Thanks

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