PHP code in a textarea, Having issues... Options

[schizo]

I'm usually able to figure this kind of thing out on my owning, but my brain is fried and I give up.

I wrote a tutorial on using PHP includes, but I can't seem to get the actual PHP include codes to show up in the textareas.

Here's the page.

Is there anyway to disable the code from actually trying to work, if that makes sense?

<--Could resist using that cute little nugget.