extern int language;
extern void error(int errorptr);
extern void message(int messageptr);
extern void bellit(void);
extern void highbackground(void);
extern void mouseshow(int x, int y, char *c, int *color);
extern void mousehide(int x, int y, char c, int color);
extern int readmouse(SONGSTYPE *songs, PARAMETERTYPE *parameter, 
                      MOUSETYPE *mouse);