taken from webappers.com
JS Charts is a free JavaScript based chart generator that requires little or no coding. With JS Charts drawing charts is a simple and easy task, since you only have to use client-side scripting (i.e. performed by your web browser). No additional plugins or server modules are required. Just include the scripts, prepare your chart data in XML or JavaScript Array and your chart is ready.
JS Charts lets you create charts in different templates like bar charts, pie charts or simple line graphs. It’s compatible with most web browsers. And it is It’s free to use and watermark-free.
Requirements: Firefox 1.5 +, IE 6, Safari 3.1 +, Opera 9 +
Demo: http://www.jscharts.com/examples
License: Creative Commons 3.0 License