problems with png texture maps and alpha

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nadia

I'm using png texture maps created in Photoshop with an alpha chanel. I open the texture with with the flags set to 1+2+16+32, then I aply it to the mesh. Looking at the mesh, the alpha areas are properly transparent as they should be. But there apear also all over the mesh triangualr holes, as if some tris where missing in the mesh. When I apply the texture without the alpha flag the whole mesh looks nice and solid...
How can I fix this?