Need help with adding jQuery script to WP and calling script to page

i usally first deregister to avoid duplicates, then register it and enqueue it like so:

function my_scripts_method() {
    wp_deregister_script( 'jquery' );
    wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js');
    wp_enqueue_script( 'jquery' );
}    
add_action('wp_enqueue_scripts', 'my_scripts_method');

Hope this helps,
Sagive.