Assigning page template to wp-signup.php

Running WP 3.0 with network enabled. Using a theme with a full-page template (page-full.php) that I’d like for the page to use as its style type. I found the code in wp-signup.php that controls this, but I don’t know php. Can anyone tell me how to edit the following to use the full page template from my theme?

function wpmu_signup_stylesheet() {
	?>
	<style type="text/css">
		.mu_register { width: 90%; margin:0 auto; }
		.mu_register form { margin-top: 2em; }
		.mu_register .error { font-weight:700; padding:10px; color:#333333; background:#FFEBE8; border:1px solid #CC0000; }
		.mu_register input[type="submit"],
			.mu_register #blog_title,
			.mu_register #user_email,
			.mu_register #blogname,
			.mu_register #user_name { width:100%; font-size: 24px; margin:5px 0; }
		.mu_register .prefix_address,
			.mu_register .suffix_address {font-size: 18px;display:inline; }
		.mu_register label { font-weight:700; font-size:15px; display:block; margin:10px 0; }
		.mu_register label.checkbox { display:inline; }
		.mu_register .mu_alert { font-weight:700; padding:10px; color:#333333; background:#ffffe0; border:1px solid #e6db55; }
	</style>
	<?php
}