thanks for the ideas.
i tried again last night and im certain that it is because my tables arent stable enough. so for the time being im going to put up with it until i find something better. i do like the idea of an old door... or anything lying around. im going to go shopping at grandparents houses and such.
i was thinking maybe small shelves or a dresser on either ends with the door screwed on top. so we'll have to see.