cube map question

glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, SkyCubeMap);

glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, GL_RGB8, SkyBoxTexture[0].Width,SkyBoxTexture[0].Height,
GL_RGB, GL_UNSIGNED_BYTE, SkyBoxTexture[0].Data);

gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, GL_RGB8, SkyBoxTexture[1].Width,SkyBoxTexture[1].Height,
GL_RGB, GL_UNSIGNED_BYTE, SkyBoxTexture[1].Data);

gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, GL_RGB8, SkyBoxTexture[2].Width,SkyBoxTexture[2].Height,
GL_RGB, GL_UNSIGNED_BYTE, SkyBoxTexture[2].Data);

gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, GL_RGB8, SkyBoxTexture[3].Width,SkyBoxTexture[3].Height,
GL_RGB, GL_UNSIGNED_BYTE, SkyBoxTexture[3].Data);

gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, GL_RGB8, SkyBoxTexture[4].Width,SkyBoxTexture[4].Height,
GL_RGB, GL_UNSIGNED_BYTE, SkyBoxTexture[4].Data);

gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, GL_RGB8, SkyBoxTexture[5].Width,SkyBoxTexture[5].Height,
GL_RGB, GL_UNSIGNED_BYTE, SkyBoxTexture[5].Data);
 

const GLubyte* str = glGetString(GL_EXTENSIONS);
if(strstr((const char*)str, "GL_ARB_texture_cube_map") == NULL)
{MessageBox(NULL,"Your OpenGL Implementation Doesn''t Support Cube-Mapping!","Extension Missing!",MB_OK); return false;}
 

glEnable(GL_TEXTURE_CUBE_MAP_ARB);
glDisable(GL_TEXTURE_CUBE_MAP_ARB);