Alpha Blending with Alpha in texture

Hello all

I'm looking through the archives, but had a question that maybe someone 
in the mean time could reply before I find the answer:

 I need to fade out a texture that already contains alpha.  Setting the 
material diffuse alpha should be enough?

Ideally, I'd like, where Ksa = Constant Src Alpha, and Kda = Constant 
Dst Alpha, is glBlend( float Ksa, float Kda).
But I'd settle for "half" that, multiplying the source by a constant value.
Out =  (Ksa*RsSr+RdDr, Ksa*GsSg+GdDg, Ksa*BsSb+BdDb, Ksa*AsSa+AdDa)

Any demo programs already setup that demonstrate this?

TIA,
Michael

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Author: Michael
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