Hello, yes (this is a bit of a long read but it is useful).
I can very easily work out that your screen resolution is 1024x768. Also, this is what you have set your site at. HOWEVER, although 1024x768 is officially the most popular surfing resolution, some people are still surfing on 800x600.
Now, what this means is that your site doesn't fit well on 800x600 (roughly 40% + use this). You should make sure your site is only 800 pixels wide otherwise the 800x600 people have to scroll sideways which isn't much fun!
An example of a web-site that caters for both resolutions is ebay.com and uk and probably all the rest of them. See that big band going down the side? That's for the 800x600 people. They won't see that band, the whole website would fit the whole screen.
Here's a picture of your site on 1024x768:
You can see your whole site fits the screen.
Here's a picture of 800x600:
Can you see the difference? The knife is chopped off on 800x600 mode. Try and make your site work for a variety of resolutions and the aesthetics will look better.