Powerhouse graphing

List, I'm looking for a class that can generate high quality and professional looking graphs using PHP. My userbase is very used of the look and feel of Excel graphs so they expect something along the lines of that. My problems are that I need to build a dynamic database backend and generate the graphs on the fly based on user input. or... is it possible to leverage Excels graphing engine as a COM object and build graphs on the fly that way? If so does anyone know where I might find examples of the code necessary to do this? I would be willing to convert ASP code over if necessary. Thanks, Ron