The correct version of Java is essential to proper functioning of several other applications. This tutorial shows you how to upgrade Java.
Click on the link http://www.java.com/en/download/manual.jsp to view the screen shot below, and follow the steps as indicated
1. For the PC: Choose the Online download for the fastest install experience.
2. For the PC: Choose the Offline download if you will be installing on a machine without an internet connection, or you are having problems with the Online install.
3. For the Mac: If you are running the Lion OS (10.7.3 or above), you must download your own version of Java. If you are using any other Mac OS, your system comes pre-installed with Java.
4. Click here to learn how to remove older versions of Java which is strongly recommended
5. Check here for other Mac-realted questions.
6. Restart your browser and if you are on a PC, you can click on the link in #6 to verify that Java has been correctly installed.