Firefox and JRE to use

Hi,
we need to run a website containing a JRE 1.5 Java Applet on a customers Windows system where Java 1.4 has been installed. Since it is not possible for us to get Java updated within the next months, some question concerning possible workarounds arose:
1. Is there any chance to get Firefox 3 to run with a certain JRE located in a local directory (without installing that JRE)?
2. Is there a Firefox plugin (similar to VB's System.Windows.Forms.WebBrowser) I could use within a .exe file where I can specify the JRE to be used (without installing that JRE)?
Thank you very much for your answers !!!

Thank you for your response, cor-el. I was able to successfully add the JRE 1.7 plugin to Firefox by modifying the existing JRE 1.6 registry entries, but I would not recommend this procedure to users that are less confident in registry editing. Too bad there is not a more user friendly way to do this.
Unfortunately the Java applet I'm trying to view is still not displayed. I've dug a bit deeper and found that the applet explicitly specifies an older JPI version (1.5.0_02). AFAIK Firefox cannot deal with this if its installed JPI (now 1.7.0_21) does not match the version requested. So either I'm going to have to dig up this older JPI version and install that too, or just switch to an alternative browser to be able to view this applet.

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