function prototype

From: <- Chameleon -> (cham_gss_at_hotmail.NOSPAM.com)
Date: 02/27/04 

Date: Sat, 28 Feb 2004 00:52:03 +0200

When I use 1st line in prototypes, compiler fails because SDL_GL_GetProcAddress return (void*)
When I use 2nd line in prototypes, compiler fails in last line because (void*) is not a function prototype.
So, what cast I must use?
Can you rewrite these 3 lines correctly?
With 1st line in prototypes, I used:
glCompressedTexImage2DARB =
    (void (*glCompressedTexImage2DARB)
    (GLenum, GLint, GLenum, GLsizei, GLsizei, GLint, GLsizei, const void*))
    SDL_GL_GetProcAddress("glCompressedTexImage2DARB");
but it does not work
-------------------------------------------------------------------------
//prototypes
void (*glCompressedTexImage2DARB) (GLenum, GLint, GLenum, GLsizei, GLsizei, GLint, GLsizei, const void*);
//void *glCompressedTexImage2DARB;

//load function
glCompressedTexImage2DARB = SDL_GL_GetProcAddress("glCompressedTexImage2DARB");

//use function
glCompressedTexImage2DARB(GL_TEXTURE_2D, z, dxt_f, width, height, 0, size, (byte*) tex + offset);

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