Graphing software for Linux?

Hello Linux folkz, I've got a project at work in which I need to access certain .csv format files with parameters and display these parameters in the form of graphs (Pareto chart, Cum. plot, Corelation, e.t.a) in the browser window (Netscape or M$ Exploder). Could somebody advise me what Linux based graphing software is the best suited for this task? I assume that I can get all these parameters from .csv files by writing script in Perl or JavaScript. But I stuck in finding how to display them graphically in the browser window. Any help or suggestions are greatly appreciated. Thanks. Alex -- MS Windows users should be covered under the Americans with Disabilities Act.