I'm a DIY designer setting up a website http://www.revive-newbury.co.uk/indexOne.php and firefox is displaying differently depending on the url I use. if I drop the www from the URL the resolution changes.

I'm completely foxed by this - any ideas?

I'd suggest you need to clear your browser cache.

Thanks for the reply - it does seem to be a problem with my computer as it displays OK on my laptop I've tried clearing the firefox cache but it didn't help, is there anything else I need to do to clear the cache fully?

OK solved it - thanks for pointing me in the right direction, I needed to clear site preferences from the cache which I didn't do the first time I flushed it.