There are a lot of ways to do load balancing, but the www22 www44 looks like balancing using DNS.
Basically you need two or more servers which you replicate the site on. This can be done as simply as uploading twice. I assume if you need load balancing then you'll be using rsync or something.
Then you need to configure your DNS. If your running a recent version of bind you can just add all the A records and it will shuffle them automatically. Reducing your TTL will eliminate (nearly) the caching problem mention in that link.