Models of The Summit: Coming Soon! Part: 2

Well, looks like some more snow days out of school in Central Alabama! So I have a ton of free time! So I have been working my butt off making these models of The Summit in Birmingham! I will only use the best of textures to model with! Right now I am working on the sign that welcomes you to The Summit when you drive in. but I have a problem, whenever I use textures with a transparent background, the background turns black... Its really hard to fix... I will post a photo of what I'm talking about later. But here are some photos of the real thing, and my model (Without the black background).