Repeating background

From: Nathan Walck


I notice on your main page that it is made at 800 x 600, but the blank space at the top doesn't seem to be there because the top blue clouds, and black bar extend to the far right side of my screen (1280 x 1024). How do you make the borders extend like that, giving the elusion that it was made at the proper resolution? If you don't get my question (which I understand could be confusing) let me know... Thanks again, Nate