Check out the exception:
com.sun.deploy.net.FailedDownloadException: Unable to load resource:
http://prime.turquoisegrotto.com/java/kainiteidol.jarWhen I type that URL into my browser it can't find it either, so your jar file doesn't exist or this path is wrong:
http://prime.turquoisegrotto.com/java/kainiteidol.jarI hope that helps. Webstart's pretty tricky at first, most of us struggle to get it working the first time, then just use the same old file again and again and forget how it originally worked, so don't worry about getting these little things wrong at first.
Cheers,
Keith