Test your browser for the Java plug-in at the Java website. (will open in a new window)
Java is free software by the SunMicroSystems Corporation that is used to display some multimedia in a browser.Blackboard 9 also makes use of Java content for many of its elements. For all operating systems, the supported version is Java Standard Edition 5 and Java Standard Edition 6
PC only: choose "Free Download"; you will probably want "Java Runtime Environment" or "Java for Windows" version 6.
Mac: Tiger (10.4) and Leopard (10.5) already include Java SE 5 (1.5). Use the Software Update feature (available on the Apple menu) to check that you have the most up-to-date version of Java for your Mac.