<body background="imagename.gif"> sets the background image
This tag lets you put an image in the background of your Web page. A big image might appear only once (depending on the size of the browser window), but smaller images will be redrawn as many times as necessary to fill a page - a process known as "tiling." Here's an example of tiling on a page at Hits.org. Notice that the field of flowers in the background is just one little square repeated all over the place. Be warned: You can make your pages really ugly by using tiling.
If you write this in your HTML document:
<body background="monkey.gif">
... then that monkey picture will appear in your background as many times as the browser window and the size of your image will allow.
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