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overlay display

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Hi, I have a question about overlay display. I have a topographic map and a thematic map. The thematic map only represents a subregion of topographic map.In my implementation, topographic map is on the top of thematic map. Normally only topographic will show. I want to add a function: user can specify the portal so he can see the underlaying map (i.e. thematic map.) through that portal. I tried to create an alpha texture then used blending. But it doesn''t work. I really appreciate any help you could give. Thanks! BTW, the size of topographic map, thematic map and portal all are different. Nancy

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