FileMaker Pro version 11 has new charting options. These are nicely integrated directly in the layout options. For simple charts, FileMaker’s built-in options are a great choice.
By clicking the legend, you can turn the graphs on and off. You can also drag and select to zoom in on specific areas of the chart.
In order to integrate with FileMaker, use the substitute function and building pieces of the chart using calculations formatted as html snippets. Next, build a master chart with variables that when processed with the substitute function, the variables are replaced with the html snippets. Click here for an example of the master chart that I used. You will need to view the source in order to see the html.
I dump the master chart into a global text field and then process that field with the substitute function. Use a separate substitute for each variable.
Make sure to check out the demo gallery to see all the charting options available.