Java Applet Disappears From Website

When I add a java applet to my web site on .Mac (inside the proper folder on my iDisk), it will run for awhile, but then will disappear. What is happening?

I created an applet from within a mathematics program called GeoGebra. I stored it on my iDisk in a subfolder in the /Web/Sites folder. I know it is in the right place because it runs fine on my website for 1 or 2 times, but then it will not run and I get an error message that the file can not be found. When I go to my iDisk and look in the folder where it was stored, it is no longer there. I know very little about html programming and java, and I don't understand where it goes. Is it because .Mac doesn't recognize java?

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    http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx
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    Regards,
    Blair Deng
    Blair Deng
    TechNet Community Support

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