How to make my applet generally available?

Hello
I have written a HTML/javascript website which is ok except that a lengthy calculation in the javascript takes an excessive time to complete. So I have recoded the lengthy calculation as a java applet which is called from javascript by
return = document.<classname>.<java method name>(param)
This was done using the J2SE Development Kit 5.0 Update 4 and J2SE Runtime Environment 5.0 Update 4. My PC is Windows XP and I use Internet Explorer 6.0.
All screen handling is still done by HTML/javascript, the java applet has no i/o apart from receiving a parameter from js and returning a value to js. This all worked fine locally, so I copied all files to my ISP's server (including the java class file) and it still works fine on my PC when accessed from the server. HOWEVER when any other PC enters the website and attempts to perform the calculation they just get an Error on Page message from the javascript link to the java applet. What do I have to do to make the application run on other people's PC's as it does on mine? I have set permissions on the class file to 755. Do I need a policy file? Do I need to sign my applet? (whatever that means).
Thanks
Bryn Crossland

For a start, very few people will have Java 1.5 installed and set up for their browser. I think applets are great (if they are doing something useful), but these days you cant depend any everyone having a JVM installed for their browser, especially since microsoft ripped Java out of XP.
Maybe you could do the "lengthy calculcation" on the server.

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