EUREKA!!! OK I now fully understand what is going on and why it is 
needed, and yes I do feel pretty silly now.

Thank you all very much for your help, especially those of you who took 
the time to write those very long explanations. Honestly guys your help 
is very much appreicated.

I've taken my dunce cap off now, but it is very close by just in case I 
need to put it back on in a hurry!!! You have been warned :o)