I must say I find hammerman's reaction to nickmo's reply a sad example of overreaction. Unwanted information can always be ignored but a lack of it can be very bothersome - and then general education is something one absorbs rather than attends classes for. I have always thought whatever such knowledge came my way was a welcome freebie and whenever it is provided/offered by others I am grateful. Unfortunately, from time to time one comes across people who want to hoard knowledge to the exclusion of others. AB is a useful forum for us to share what we know, let's use it well and generously and not get worked up in competition or worse. Life is too short......