Javascript graphing of data in Codeigniter

Finish an online "demo" project started in Codeigniter. Need to add some data-graphing abilities. I already have a Codeigniter installation at [login to view URL], and the data input ability into a relational database is working. I now need to have inside of the admin some graphing functionality using jquery or some javascript functions so that I can create line graphs of the data. I don't need a comprehensive set of functions at this point as it first has to serve as a "demo" before my employer decides to launch the development of a full application. No data has to show to the public world.