GLSL Fade In/Out

Hello,

I had a game running on Blender Multitexture Materials, and in this I had several alpha planes used to fade the scene in and out. This worked by having a black UV texture on a shadeless plane, activating the alpha button in UV buttons, and animating the alpha value with TexFace and Alpha enabled in the Material Panel.
However when I switched over to Blender GLSL Materials, these planes turned shadeless white and did not fade or anything. How can I either repair them or replace them with another fading method?

One of these should help

http://blenderartists.org/forum/showthread.php?t=147280

http://blenderartists.org/forum/showthread.php?t=179716

http://blenderartists.org/forum/showthread.php?t=169472

Best of luck.