WebReference.com has a simple new tutorial today showing how to create alternating table rows in the output for your application.

Almost every database driven Web site uses alternating row colors when displaying a list of records, a concept used all over the Internet. You've seen it used, you like it, and now you want to do it yourself. But you're not sure how to accomplish it. Well you've come to the right place. I'm going to discuss the basic idea behind achieving this and give some concrete examples demonstrating different ways to implement it.

Their script loops through the information (numbers in their case) and checks, using the modulus operator to check and see which of the CSS styles it should apply to the div. To give a range of possibility, they also show how to do it with a while loop instead of a for to do a little benchmarking of the methods.