Multiple Texture Problem

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I have a mtl and an obj file. Mtl file has two materials and in each material 
it has two diffrent textures. 
When the object is parsed two textures are displayed in same time. For example, 
Object has two diffrent color in it.
I want to display only one texture and I want to display a diffrent one when i 
push a button. 
Any help will be appreciated.

Original issue reported on code.google.com by [e-mail] on 23 Aug 2012 at 7:20