JS code standards and overriding

Here is a patch fixing code standard and changing ajaxScreenLock to Drupal.ajaxScreenLock

With these changes you can do the following in your custom code (I have changed the css value passed to the blockUI plugin):

  /**
   * Modified ajax_screen_lock function.
   */
  Drupal.ajaxScreenLock = Drupal.ajaxScreenLock || {};
  Drupal.ajaxScreenLock.blockUI = function () {
    Drupal.ajaxScreenLock.unblock = true;
    if (Drupal.settings.ajaxScreenLock.throbber_hide) {
      $('.ajax-progress-throbber').hide();
    }

    $.blockUI({
      message: Drupal.settings.ajaxScreenLock.message,
      css: {
        top: ($(window).height() - 90) / 2 + 'px',
        left: ($(window).width() - 90) / 2 + 'px',
        width: '90px'
      },
      timeout: Drupal.settings.ajaxScreenLock.timeout
    });
  }

Thanks
AndyB