Hi!

I'm writing a 2D multiplayer game. It is basically a beat-em-up style game with two characters facing each other.
The ground is two green triangles, with no texture or anything. The characters are also two triangles but this time with texture. when i make the bg colour on the characters transparent, the ground turns black or worse, disappears completely!!

HELP!!!

Has this happened to anyone else? Do you know why this happens.
Please post me the answer!!

James