Carolly,

Thanks so much, I posted that pretty much as a joke, but it is a question that seriously bothers me. I really hate finding myself totally incapable of understanding something. I don't say that your reply has given me an understanding of the phenomenon, but it's sure set me thinking!

Just wish it wasn't 2.30am here, thinking about this stuff isn't conducive to a good nights rest.

John the very sleepy