HRGN CreateEllipticRgn(
  int nLeftRect,   // x-coord of upper-left corner of rectangle
  int nTopRect,    // y-coord of upper-left corner of rectangle
  int nRightRect,  // x-coord of lower-right corner of rectangle
  int nBottomRect  // y-coord of lower-right corner of rectangle
);
 

 
DECLARE INTEGER CreateEllipticRgn IN gdi32;
    INTEGER nLeftRect,;
    INTEGER nTopRect,;
    INTEGER nRightRect,;
    INTEGER nBottomRect