Is there a dynamic way to use extensions?

Ok, Ranch pals... I have a huge problem...
There's an app o' mine that is bundled in a jar file. It's an Applet, but that doesn't matter. What really matters is: the jar file uses an extension. An extension from Sun. To use that and install it automatically in the client machine I have to put that extension in the MANIFEST file for my app, like the code that follows:
Manifest-Version: 1.0
Extension-List: jai_imageio
jai_imageio-Extension-Name: com.sun.media.imageio
jai_imageio-Specification-Version: 1.0-mr
jai_imageio-Implementation-Version: 1.0_01
jai_imageio-Implementation-Vendor-Id: com.sun
jai_imageio-Implementation-URL: http://someeirdaddress.com.any/anything/herecomeswhatisimportant/jai_imageio-windows-i586.jarThe thing is: my clients have to have this jar file (jai_imageio-windows-i586.jar) in their server, so it can be downloaded and installed (in my case by the Java Plug-in). But the address to this file (http://someeirdaddress.com.any/anything/herecomeswhatisimportant/jai_imageio-windows-i586.jar) has to be inside the MANIFEST file, which is terrible, because if I have 1 zillion clients I'll have to pack my jar 1 zillion times, changing the MANIFEST everytime.
So! The question that is reeeeally bothering me is: "is there a way to set that my app uses an extension from outside the MANIFEST file, say, from my code? If yes, how? If no, is there any auto-checking-and-installing solution for my problem?"

Because it is going to be used in an intranet and I can't know for sure that all machines will have access to the internet. So, the file must be in the local server, and they often have different addresses. I don't need the MANIFEST to be dynamic, but the mechanism to use extensions. But, if the only way of doing this is having a dynimic MANIFEST file, ok.

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