Sure, all our applets can be used for free on your site. But without the id_key, a link to this site will appear when the mouse is moved over the applet.
To have the link removed or be able to change the link to point somewhere else, you'll need to purchrase a id_key for the domain you wish to host the applet on.
The .jar file is the only file required to run the applet. A .jar file is just a
file with all the class files zipped up. It is use for faster loading. If you
wish to see the class files change the .jar to .zip and unzip it, but it's not
nessecary.
Make sure all the jar and class files are uploaded to your web server. If your web page document is not located in the same directory as the class files, you will need to add the tag codebase inside the applet tag.
For example, if your class files are located in "http://www.abc.com/applet/" and your document is located in "http://www.abc.com/doc.html".