For the sake of this all taking off in the wrong way, might i suggest Daphne, that you do a search on this topic. I know that there was a very long and quite thorough discussion of what you are asking.
My mind is drawing a blank at the moment, so i'll have to come back to it.
You tell em' Stevie!!!!
Cassie
p.s. ok, so i looked and the thread was started by our friend BRANDYJ, and since it went to 7 pages you should find lot's of valuable info there. Sorry but i would provide the link if i knew what the heck i was doing.
Maybe someone more knowledgeable could consider that a hint.