Making objects fall

[gigaman]

I am making a mario game (yes i know the picture used is luigi) The problem i am having is making the character fall. I was trying to use threads but i don't understand them and i am not even sure they would work. Any help is appreciated

[Tony]

inside your game's loop (so during each frame render) accelerate your character downwards by a set amount.

make sure you're not letting things fall though the floor though

[gigaman]

Since positions can't be altered in the general declarations (yes obvious) should i do this in a timer?