Using jQuery to display graphs

plugin flot creates graphs on the fly.
http://www.innovatingtomorrow.net/2008/03/27/flot-graphs-jquery

Charts and Graphs Plotting with JQuery plugins
http://www.84bytes.com/2008/09/21/charts-and-graphs-plotting-with-jquery-plugins/

CMS Examples

ZenCart: http://www.mycenturyweb.com/zencart/
Joomla: http://www.mycenturyweb.com/joomla/
Drupal: http://www.mycenturyweb.com/drupal/