I have an image that I want to use for the background of my web site. It is 792 X 612 px and 96/in It fills the screen rather nicely on my 1440 X 900 resolution screen. If I increase the size to 1440 x 900 it is too big for smaller screens. If I modify my img tag to to display it at 100% it's just goes back to the original dimensions and does not cover the screen except at 800 x 600 screens. How can I make sure the image will fill the screen of the smallest to the largest screen resolutions?