69382 Split test script

I need a script that will distribute traffic evenly between 2 or more web pages for the purpose of A/B split testing. If you're not familiar with split testing, it works like this. Let's say you have 1,000 unique visitors to your website, and the script is dividing the traffic between page1 and page2. The reason for this is because page1 has a different headline (or offer, or price, etc) than page2. By doing this, I can tell which page is the better seller. Here's what I need the script to do: 1: It must divide the traffic evenly. Like flip-flopping it back and forth. 2: It must deposit some kind of cookie so that the viewer is forced to go back to that same page when they arrive at the script again. 3: The script needs to be able to track the statistics from the "thank you pages". Let's say page1 sells 5 widgets, and page2 sells 13. The script will know this, because when the customer arrives at the thank you page, something on that page will call up the script again (an IMG, or SSI code, or whatever). 4: There needs to be some kind of really basic control panel & stats page for me to be able to view the results at a glance. The control panel / stats page should: a: tell me the amount of unique visitors b: tell me the amount of successful actions (sales, optins, whatever) c: allow me to start a new campaign without having to erase the stats from the previous one. This way I can remember which headlines I tested. d: allow me to enter the URL's of the pages I'm testing (so the script will store this info, and when the script is called... it will flip-flop the traffic. e: display which page was the winner, and by what percentage (page1 got 314% more opt-ins than page2). f: I should be able to log in and out of the control panel / stats page. That's about all I can think of. Every script I've tried is either too convoluted, or impossible to install. Hope you can put something good together for me. Just so you know, I plan on using this for personal use AT FIRST... but then eventually I will hire you again to spruce it up so I can turn it into a commercial product. I will own the copyright. Just need the script. Please post a demo if you have one available.