Daddyman: Go to Profile at the top of the page, and then on the lefthand side, you will see "Look and Layout Preferences". In there should be a list of check-boxes, and next to one of these it should say "Show most recent posts at the top." To have the oldest messages at the top, UNcheck this box. To make the Newest messages at the top, make sure it has a check in it.
I understand your wish to have this; I myself can't stand seeing the newest reply first either
Let me know if this fixes the problem!