Ok, I just find the solution
in the manual
var chart1 = new FusionCharts("../../FusionCharts/Column3D.swf", "chart1Id", "400", "300", "0", "1");
change to
var chart1 = new FusionCharts("../../FusionCharts/Column3D.swf?registerWithJS=1", "chart1Id", "400", "300", "0", "1");
Another question, can I attach some information to the chart using that javascript invoke method before it post back to FusionChartsSave.php? ie: I want to add user_id so when PHP script generate image it'll save to certain folder with certain name and I can do further process. My main purpose is to create PDF with image of the chart.
Thanks,
Ferry