Check this video out at Hi-Res here: http://www.tutvid.com/tutorials/dreamweaver/tutorials/interBackground.php

So many Web 2.0 style sites, matter of fact many sites in general have these backgrounds that seems to go on forever but have one unique end and seem to fade off to an image or color that appears to go on forever. This is simply an illusion and really can be done very easily with CSS and a 1px wide image! We will start with a blank Photoshop doc and first create our background then bring it into Dreamweaver and make our background using CSS. Please check out http://www.tutvid.com for more great training material!