John ... I'm not sure what types of applications you're looking for, but I have some JavaScript plots that might be interesting to test ... http://fastq.com/~sckitching/JS/Circle_MH.htm http://fastq.com/~sckitching/JS/DD_Circles.htm http://fastq.com/~sckitching/JS/Parabola.htm -- Cousin Stanley Human Being Phoenix, Arizona