If you use our[url=http://www.phy.ntnu.edu.tw/ntnujava/simulationBuilder/] physlet builder interface[/url], you can create new simulation and you will be able to get file for offline use automatically(just click [u]send to my email [/u]button).
You can check out demo from [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=519.0]Demo for EField (two point changes, drag one of them and see force/field lines)[/url] or [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=518.0]Demo for animator (create particle moving along an analytic curve and plot graph[/url], which will show you step by step instructions -- how to use the interface to create new simulation. It should be easy to use and you will get related files in your email account. Try it by yourself.
P.S. If you change the content of resource file for the applet(shown in previous message), you can have the labels shown in different language format.