on the first keyframe in your clip, normally on a layer named actions put this:
ifFrameLoaded (700) {
gotoAndPlay (1);
}
This says"hey if the frame 700 of the current scene or name of the scene is loaded then goto and play frame 1 of this scene. look below to tell the MC how to loop until the frame 700 of the scene has loaded.
On the second keyframe of the actions layer put this:gotoAndPlay (1);
This will keep looping the scene your attempting to load until it has, then it will play for you. You can be creative by giving the user some notification in the form of some text that says"Loading...." to indicate to them something is gooing to happen once they wait. Hope this helps,
Rich