They use Flash. http://code.google.com/apis/visualization/documentation/gallery.html http://code.google.com/apis/visualization/documentation/gall... Open flas

They use Flash. http://code.google.com/apis/visualization/documentation/gallery.html http://code.google.com/apis/visualization/documentation/gall... Open flash chart ,an open source project: http://teethgrinder.co.uk/open-flash-chart/ http://teethgrinder.co.uk/open-flash-chart/