I have just finished building a new web page in HTML 5 and using a jQuery slider effect to horizontally scroll across the web pages.

Now I need to design a background at 8000x1000px so it all "flows and connects" prefectly between each seperate background image. To do this, I need to divide this large 8000px image into 4 separate 2000px background files.

How can I create 4 images from 1 source file using Illustrator (currently using CS3) that will stitch seamlessly?