void FadeCrossSaveBackbuffer();
void ClearWindow();
+void SetWindowBackgroundImageIfDefined(int);
void SetMainBackgroundImageIfDefined(int);
void SetMainBackgroundImage(int);
void SetDoorBackgroundImage(int);
void PlayMenuSoundStereo(int, int);
void PlayMenuSoundIfLoop();
void PlayMenuMusic();
+void PlaySoundActivating();
+void PlaySoundSelecting();
void ToggleFullscreenIfNeeded();