Java 1.5 Applet coexisiting with other versions of Java Applets

We have a situation where an applet has been developed using java 1.5; however, the end user machine has java 1.4.2_03 which is required for different java applications/applets. We can not install java 1.5 since it will break multiple applications using java 1.4.2_03.
Is it possible to use a java 1.5 applet on a machine in such a way that only the applet will use java 1.5 and all other java applications/applets will continue to use the default java 1.4.2_03?

when compiling you can decide which compliance you want, java 1.5, 1.4 ...
furthermore you can also set the vm-version when executing an application. (java -version:1.4)
im not sure tho, if theres a way to use that for applets as well, i guess it depends on the particular browser plugin.
i guess its easier if you just down-port your applet to 1.4.

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