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>> Jon, your explanation was very clear. I was simply thinking too much. :) It's funny you should say that because one of the things I teach students is that one of the good things about using subprocedures/canned functions etc. is that you _don't_ have to think about how they work - you just use them! Guess the old habits of having to worry about the effect of every line of code are hard to break ;-) Jon Paris Partner400
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