This firefox addon allows you to easily check how your website looks in various screen resolutions: Code: https://addons.mozilla.org/en-US/firefox/addon/firesizer/ A lot of members would already know about this but others would find it useful.
You may be interested also in services like this. You can check there your website on different browsers.
your 999 thanked was pissing me off sorry had to change it to 1,000 Plus nice addon will give it run Cheers