Java won't work in Mozilla 1.3.1

OK, after much turmoil I have finally gotten Evolution 1.4 to work and as a side benefit, the Ximian "Mozilla" (needed in order to get Evolution to work) is a vast improvement font-wise. However, I can no longer get Java or Flash to work even though the plugins are present. I've tried to manually set them up ("application/x-java-vm" and "application/x-shockwave-flash") but I don't know what the respective extensions are (i.e. .exe, .jre, etc.). Any help would be appreciated. Zach