functions.php

// Remove scripts from the wp script queue:
// credit http://justintadlock.com/archives/2009/08/06/how-to-disable-scripts-and-styles
function rv_deregister_javascript() {
  wp_deregister_script('comment-reply');
  wp_deregister_script('l10n');
}

// Replace jQuery 1.4.4 with 1.5 on the frontend
// as seen on http://codex.wordpress.org/Function_Reference/wp_enqueue_script
// Do not do this on the wp-admin, jQuery 1.5 might break functionality at this point (March 2011)
function rv_latest_jquery() {
  if (!is_admin()) {
    wp_deregister_script('jquery');
    wp_register_script('jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js');
    wp_enqueue_script('jquery');
  }
}