textarea html generation problem

["sean greenslade" <zootboysean@xxxxxxxxx>]

Hi all! I am trying to make a PHP HTML editor. I have made the entire editor
function, but it has a big problem. If the page contains a </textarea> tag,
it ends the editor's textarea and the browser starts rendering the HTML. How
do I go about preventing this from happening?

Thanks a lot!
--Zootboy