bathroom door stop
If your bathroom door stop won't hold the door open anymore you can get the little spring loaded door holder opener thingy from Foretravel's parts department. Sorry to use technical terms. 
Getting the old one out of the door can be a little frustrating. I tried several ways and finally drilled it out until it got stuck on the end of the drill bit and spun around in the hole, then pulled it out of the door. I had to get the thing off my drill bit of course, but at least it was outta the door. It's the exact same part that holds the closet door open, so you could swap them out if you never prop your closet door open.
Topic: bathroom door stop