The javascript used for defining polar, pie and doughnut charts is different from the javascript used for line, radar and bar charts.
Polar, pie and doughnut charts:

1. accept only one series of data
2. require each data value be defined with its own color.

To know how these charts are implemented

1. run one of the following CGI programs
2. display the source of the WEB page generated from that CGI program
3. look at the javascript for each of the charts

The following CGI programs are available:

• sales which reads a database file member and displays the three different types of chart
• yrdata which displays the three different types of chart generated from your data input.