Open Flash Charts is open source. So you get the source code of the chart to keep, this means that if you find bugs and need to fix them, you can. Or if you are worried that this website may dissapear, even if it does (don't worry, it won't), you have the code and can hire a flash programmer to fix any problems you have.

Don't forget to clear your browser cache when you have downloaded the Open Flash Chart files. This will remove any cruft that may cause you problems.