*** For Apache 2.2 and php 5.x, we have a new custombuild script available:
http://files.directadmin.com/services/custombuild/1.1. It will install both apache 2.2 and php 5 automatically for you. It also contains code for installing mysql 5. The custombuild script is considerd the more recent way to install apache 2, php 5 and mysql 5. The rest of the guide will still work, but it's more time consuming.
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To convert apache 1.3 to apache 2.0, use this guide:
directadmin.com/features.php?id=441