[xwiki-users] Dynamic chart question

Hi I am looking to dynamically chart some historical data I have stored in our wiki and am wondering if anyone knows the best way to approach this? Basically I have two date fields to pick what dates to run the query through, and several other options of things to graph over time. I would like to be able to just refresh a portion of the page or perhaps even the page itself (store the values I need in an attached object?) If anyone knows a good way to implement this that would be appreciated. Adam