I have a formule like this: (setq bb_bw_h (/ (- bb_x (* bb_c 2) (* bb_b 2) bb_bw 30) (- bb_bw_a 1))) When bb_bw_h reaches to high I want to display an alertbox. (alert "To High") So far So good. Now I want to display the value of bb_bw_h I the alertbox Something like this: (alert "To high = bb_bw_h") Who want to help me? Michel ..