[Plugin: LeagueManager] Load Script Separately

Is there a way to load jquery, stack and thickbox (‘or better change it for fancybox’) outside the header, well I mean in the footer??

I tried all in my possibilities, like
in header:

wp_deregister_script('jquery');
wp_deregister_script('thickbox');
wp_deregister_script('sack');

then add to function.php

function my_init()
{
	if (!is_admin()) {
		wp_deregister_script('jquery');

		wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js', false, '1.4.2', true);
		wp_register_script('sack', get_bloginfo('url') . '/wp-includes/js/tw-sack.js', array('jquery'), '1.6.1', true);
		wp_register_script('thickbox', get_bloginfo('url') . '/wp-includes/js/thickbox/thickbox.js', array('jquery'), '3.1', true);
		wp_enqueue_script('jquery');
                wp_enqueue_script('thickbox');
                wp_enqueue_script('sack');
}
}
add_action('init', 'my_init');

any idea how to make this possible?

thanks all