Yes, that's it. You got it working!  :-)
I have a few comments though:
- It will look better if you set the background color of the applet to
match your website, so you get rid of that ugly white square around
the emulator.
- Also, the emulator screen becomes taller when you load PAL games, so
it would be better if you give the applet some more pixels in height.
Like with Seaquest, for instance, the console controls are getting
cropped. If you match the background color, the extra space will be
almost unnoticeable.
If you look at 
javatari.org, you will see an example of how to set the
background color applet parameter.
You must pass the decimal representation of the RGB color you want.
Like 00FFFF would be 65535.
Please tell me if you need any help!
I don't have any proper donation area, but I usually receive some
donations at my Paypal account 
ppe...@gmail.com.
Also, it would be great if you could somehow credit me on your site. A
mention and a link to 
javatari.org near the emulator would be
fantastic!
Regards,
Paulo