Character Limitation Using Thesis

I have a form that really needs character input limitation.

I've read several posts on the forum regarding stopgap solutions until 1.4 is released.
I'd love to use jTextareaCounter because it provides feedback -- but I don't have the "chops" to deploy it.

Accordingly, I'm thinking about this easy solution to bridge the gap:
http://forum.gravityhelp.com/topic/limit-characters-in-paragraph-text-field

My only problem is that I use Thesis -- and it's header.php does not have </head> tag.
I have copied the header.php code below.
Can someone please give me some guidance on how to modify it.

Thanks

<?php

function thesis_header_area() {
	thesis_hook_before_header();
	thesis_header();
	thesis_hook_after_header();
}

function thesis_header() {
	echo "\t<div id=\"header\">\n";
	thesis_hook_header();
	echo "\t</div>\n";
}

function thesis_default_header() {
	thesis_hook_before_title();
	thesis_title_and_tagline();
	thesis_hook_after_title();
}

Thanks Kevin. Works perfectly.

Can I contact you via email to discuss two other issues that require showing you screen grabs?