Textarea Inside Of Textarea

I am writing a small database utility to catalog all of my favorite ASM/JS/VBS functions and scripts on an asp page. Everything is going smoothly except for one thing that I can't quite seem to think my way around.

I am using a <textarea> to display the code but some of my scripts have <textarea> tags in them and when the </textarea> tag is entered, it closes my <textarea> and the rest of the code ends up outside of the textarea.

Example: (the code after the middle </textarea> show up outside of the textarea box)

<textarea>
code...code...code...
code...<textarea></textarea>code...
code...code...code...
</textarea>