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Rendering to a texture

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Hi, my intent is to render a scene to a texture as in the tutorial on gametutorials. The only difference is: I want the scene rendered to the texture from a different point of view. Say i want the scene to be rendered with:
gluLookAt(0,0,0,  0,0,-5,  0,1,0) 
but the "texturized" one to be rendered with
gluLookAt(0,100,0,  0,-1,0,  0,1,0) 
so i can have an overview of the scene from the top looking to bottom. I''ve tried:
glu.gluLookAt(0, 0, 0,
              0, 0, -5,
              0, 1, 0);
// do lights...
   glu.gluLookAt(0, 100, 0,
                 0, 1, 0);
   gl.glViewport(0, 0, 512, 512);
   gl.glBindTexture(GL_TEXTURE_2D, mirror[0]);
   gl.glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, 512, 512, 0);
   gl.glViewport(0, 0, width, height);
but it doesn''t work... How can I do this ? Thanks!

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glu.gluLookAt(0, 100, 0, 0,-1,0, 0, 1, 0);

The up vector must not be parallel to the line of sight from the eye to the reference point.

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