Animate both DVAR and ALPHA

hi, i am using DVAR in conjunction with an image with alpha to fade in /out. how do you do this???
I can’t find where to animate dvar, only alpha.
i need DVAR as my image is a png with transparency
(BGE2.49b)

in reply to my question, i solved it, didnt need dvar, just used OBCOLOUR (im using GLSL) to set transparency