extern int ScreenScrollXPos, ScreenScrollYPos;
-extern int ShowPanel;
extern int ExplosionShake;
extern boolean NoDisplayFlag;
-extern long DisplayMinX, DisplayMaxX, DisplayWidth;
-extern long DisplayMinY, DisplayMaxY, DisplayHeight;
+extern long DisplayMinX, DisplayMaxX;
+extern long DisplayMinY, DisplayMaxY;
extern void subDisplayLevel();
extern void ScrollTo(int, int);