jQuery checkbox enable

<?php
add_action('admin_print_scripts-post.php', 'enable_checkbox_script');
add_action('admin_print_scripts-post-new.php', 'enable_checkbox_script');

function enable_checkbox_script() {
	<script type="text/javascript" language="javascript">
		jQuery(document).ready(function() {
			jQuery('input[id^=in-couponbook-]').each(function() {
				jQuery('#'+this.id).removeAttr("disabled");
			});
		});
	</script>
}
?>