I was trying to access my back account but I could not due to problems with the java. Talking with a friend, he told me what i have to install to get it working. If you want to use Java in Ubuntu 64bits you have to use "sun-java-plugin". To install it use this command:
sudo apt-get install sun-java6-plugin
PS: Forgive me for publishing just a little. I was traveling and now I have some tests in university.