I had been wondering how sites sprinkle ads in irregular parts of their index page. As it turns out, it's just a matter of a simple if statement I put at the end of my Drupal node.tpl.php template file.

What does the preg_match do you ask? I don't think professors at school should see the ads on my site, since I do occasionally post assignments on my own site in addition to or instead of WebCT. The regex doesn't show the ads to the ucf.edu netblock or major local ISP address blocks.