You can go to either of the sites below to check if you have Java installed or what version of Java you are running:

http://www.javatester.org/version.html

http://java.com/en/download/installed.jsp

The minimum requirement is Java Version 1.5.1, but Cytobank will function best with the most updated version.

Note:

Mac users should use the Apple software update feature to install Java.
PC users can download the latest Java version from http://www.java.com.