I asked a similar question a few months ago and received a number of flame-free replies. If it would be useful for me to re-post a summary, let me know. --- Prentiss Riddle ("Aprendiz de todo, maestro de nada.") --- Opinions expressed are not necessarily those of my employer. --- riddle at woton.UUCP {ihnp4,harvard}!ut-sally!im4u!woton!riddle