blend texture for videoplane-layers

Hi everybody,

I can't find a proper solution on this issue; maybe there's somebody willing to help me out...

I want to use multiple jit.gl.text2d objects rendered by jit.gl.gridshade as layers. In the "final mix" I need to be able to control the layers :arranging and switching on/off. Because I also need them layers to blend (like index-colours), I'm working with videoplanes.
The problem is that I can't blend two videoplanes existing out of a jit.text2d-texture. When I say blend I mean blending the background..

I attached the patch, bless the omniscient minds..

Regards, Olger