this code make sliding collisions ; it's like the one in db's example, but I think it's better because it detect which side of the object the player hit.
here's the code (I hope that it will work, usually when I post, it doesn't work)

He he he! Where's the code!!! I don't see any code!

click on the "source" button, under the message
please, tell me what you think about it, if I have to modify something