void ClearWindow();
void SetWindowBackgroundImageIfDefined(int);
void SetMainBackgroundImageIfDefined(int);
+void SetDoorBackgroundImageIfDefined(int);
+void SetWindowBackgroundImage(int);
void SetMainBackgroundImage(int);
void SetDoorBackgroundImage(int);
void SetPanelBackground();
int el2preimg(int);
int font2baseimg(int);
+int getBeltNrFromBeltElement(int);
+int getBeltNrFromBeltActiveElement(int);
+int getBeltNrFromBeltSwitchElement(int);
+int getBeltDirNrFromBeltElement(int);
+int getBeltDirNrFromBeltSwitchElement(int);
+int getBeltDirFromBeltElement(int);
+int getBeltDirFromBeltSwitchElement(int);
+int getBeltElementFromBeltNrAndBeltDir(int, int);
+int getBeltSwitchElementFromBeltNrAndBeltDir(int, int);
+
unsigned int InitRND(long);
void InitGraphicInfo_EM(void);
+void PlayMenuSoundExt(int);
void PlayMenuSound();
void PlayMenuSoundStereo(int, int);
+void PlayMenuSoundIfLoopExt(int);
void PlayMenuSoundIfLoop();
+void PlayMenuMusicExt(int);
void PlayMenuMusic();
void PlaySoundActivating();
void PlaySoundSelecting();