thanks for all the replies and feedback - very useful.
I think I've got around the compression thing now.
I hear that selecting a screen size to suit all is about as easy as getting a load of filmwasters to agree on the perfect film format/dev combination
. The site is set at 1024x 768 and looks just as big as i wanted it to on my 19" monitor set to 1440 x 900 and my 13" macbookpro at 1280 x 800. I dont really want to use images any larger than 400x400 and if I use a percentage based centred set up, the elements all look much too far away from each other when the screen is maximised. Is my ignorance making me miss something here?
I agree about the thumbs and will enlarge them a bit - but I also wanted them to not give away too much, so viewers are invited to click to see the full thing. I agree about the multiformat thumbs so will have a look at that too.
thanks once again - I can always rely on the FWs to give good advice.