This document discusses using jQuery for theming in Drupal. It provides prerequisites for using jQuery including Firefox, Firebug, JQuerify bookmarklet, and a Drupal 5 install. It discusses jQuery philosophy of progressive enhancement, unobtrusive code, and being lightweight. It also discusses using jQuery to enhance browser support and integrate jQuery into Drupal through the core jQuery version and jQuery Update module. It demonstrates using Firebug and JQuerify to experiment with jQuery commands and adding jQuery code to Drupal through the ready function and drupal_add_js().