jquery UI in wordpress admin

This is what I include in my calendar plugin:

  // Alternative solution for loading scripts only in plugin page
  if( (is_admin() ) && (isset($_GET['page'])))   { 
      // Register scripts and styles
      add_action('admin_init', 'wp_eventcal_init');
  }  

  function wp_eventcal_init() {    
    // Only load these scripts in Admin
    wp_deregister_script('jquery-ui-core');
    wp_register_script('jquery-ui','http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/jquery-ui.js',array('jquery'));
    wp_enqueue_script('ui-datepicker', plugins_url('js/jquery.ui.datepicker.min.js',__FILE__));
    wp_enqueue_script('ui-timepicker', plugins_url('js/jquery.timepicker.js',__FILE__));
    wp_enqueue_script('wp-calendar', plugins_url('js/wp-eventcal.js',__FILE__));
    wp_enqueue_style('event_cal_css', plugins_url('styles/eventcal.css',__FILE__));          
  }

Then I just do this:

jQuery("#event_startTime, #event_endTime").timePicker();