[Dev-C++] Transparent sprites in allegro?

[<hor...@te...>]

Hello everybody!
I'm currently working on a game using the Allegro library.
But, I don't understand how to draw transparent sprites.
I don't understan what they when they're saying "first you have to set =
up the color map". Oh, yeah, that would be great... but how?
Can anyone maybe write a few lines of code just to show me how to load =
and draw a transparent sprite?
If so, I would be very happy!
Thanks in advance!
//Johan H=F6rnell