Stained glass material settings?

I have a TGA file that I want to apply as a texture to a church window. The alpha channel looks like the black and white image. When I apply the transparent diffuse, the glass is totally transparent instead of coloured. What settings should I use to make it look like a stained glass church window?

PS There are a few other answers in the forum for getting light to shine through the window, but I am just looking for the settings for the initial texture.