NYCBOII123

so you are saying i should downgrade my java version? because both my macs are running 10.8.1 but runescape only works on my macbook pro

I havea Macbook Pro that runs Runescape perfectly. I recently bought a new iMac. They are both running 10.8.1. The problem is that when the Runescape Applet opens, it loads and everything but when I have to type in my login info, it wont respond. Meaning it won't let me type anything I click the line to type but nothing happens. Any ideas how to get around that?