This code snippet removes JavaScript (including jQuery) from your WordPress website’s header and moves it to the footer, optimizing your page load speeds. Just paste it into your theme’s functions.php.

if(!is_admin()){
	remove_action('wp_head', 'wp_print_scripts');
	remove_action('wp_head', 'wp_print_head_scripts', 9);
	remove_action('wp_head', 'wp_enqueue_scripts', 1);
	
	add_action('wp_footer', 'wp_print_scripts', 5);
	add_action('wp_footer', 'wp_enqueue_scripts', 5);
	add_action('wp_footer', 'wp_print_head_scripts', 5);

	wp_deregister_script('jquery');
	wp_register_script('jquery', ("http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"), false, '1.3.2', true);
	wp_enqueue_script('jquery');
}

See original article on moving JavaScript to WordPress footer.