If you have a screw look in something made of wood, just remove the screw and fill the hole with wood putty. Let the wood putty dry and then reinsert the screw.
Wood putty works fine... but so does a wooden match stick. Just remove the loose screw, insert the wooden match in the hole, break it off even with the surface and then reset the screw into the hole. The match will tighten everything right up. It's a quick fix and works great. You might even choose to put a bit of Elmer's glue on the match stick, but you don't have to.
A faster (and cheaper) fix is to remove the screw; put one or more wood toothpicks in the hole, breaking them off at the surface, and replacing the screw. If you won't be needing to replace the screw any time soon, dip the toothpicks in white (or wood) glue before putting them in the hole.
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