Change the rules for syntax highlighting?

[Frogdice]

How can I change the rules vBulletin uses for syntax highlighting when using html and php tags?

I have been trying to create a code tag that actually does NO processing of code inside of it. If I could take my HTML tag, and turn off all the color changes inside, that would somewhat do the trick.

But I cannot find where vBulletin has its rules for syntax highlighting of html code.