Whoa! Let's dial it back, guys! I'm far too long in the tooth to get upset about comments on a forum! (I think Repeater may have missed my smiley after my comment about trying harder!).
I'm just glad that several people took the trouble to look into my problem and came up with several solutions, one of which solved the problem perfectly. So, thanks again to all. And I do recognise my current difficulties with understanding libraries - it's a big switch from what I have been used to.
Oh, and the substitution of a '/' for a ':' was just a typo - sorry, but at my age the poor old addled brain can't handle too many things at once!