php.net message formatting

Hi. I have created a forum called KASL Forums (a few years ago). I am currently working on making the forum a bit better on my new personal site at http://outklaw.com (I sold http://kasl.info a couple of years ago) and have been trying for 3 years to get the message formatting to do just as it does at php.net. For example, Go to this post here at http://outklaw.com/forum/forum_messages.php?f=1&g=3&t=54 The stuff in the grey blocks is code, and the rest isn't, so it is defined just fine. However, for php code, I would like it to turn out as it does at php.net(not in the monotype font of the highlight_string function). I would appreciate your help greatly and have referenced php.net for years! ======= Kris Law aka kasl33