The though of asking a boss for $1800 for A pair of glasses, just didn't appeal to me. That is another reason the Z-screens sounded better too. -- Brent L. Bates NASA-Langley Research Center M.S. 294 Hampton, Virginia 23665-5225 (804) 864-2854 E-mail: blbates at aero4.larc.nasa.gov or blbates at aero2.larc.nasa.gov