If you can see the image of the windmill and clock, then you already have java and you can skip this page.

If you can not see the image, then you either need to download Java or need to enable Java.

If you need to install Java, here is how:

Go to www.java.com
Click on "Java software download" at the top of the page
Click the "Begin download" button
If you already have Java installed, it will be detected and you'll be re-directed to the main java.com page
If you don't have it installed, you'll be prompted once the download is complete
You may or may not be asked whether you'd like to "Install ActiveX" at this time - if asked, say "yes"
Re-boot your browser and Java should be running automatically
Note: If you're using IE in Windows and have a pop-up blocker, you'll need to de-activate it temporarily in order to install Java. Once the install is complete, simply re-activate your pop-up blocker and you won't notice anything different.