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[edit] Install Java 6

The Fireball and GULP user interfaces require Java version 6. Java can be downloaded from Sun's website. Choose the Java Runtime Environment (JRE) 6 download. You will need to accept the license agreement, and then download the version for your operating system. Please choose a 32 bit version if possible. If you are using windows, simply double click the executable when it is done downloading and follow the instructions.

If you are using linux, you will need to change the file permissions of the installer file. Open a terminal and locate the file. Type "chmod +x 'filename'" without quotes, where 'filename' is the name of the file you downloaded. If you downloaded the rpm version, you will now need to log in as the root user. Next, simply type that same filename and press enter to execute the installer. The license agreement will display. You will have to press the spacebar several times and type yes to accept the agreement, and it will begin to install.

[edit] Java Web Start

Java web start uses jnlp files to launch applications. However, some browsers may not be configured to handle them appropriately. If you are using Firefox on linux and it downloads rather than executes jnlp files, perform the following steps:

• Open up a terminal and enter the command "rm -rf .mozilla/mimeTypes.rdf" without quotes. This will reset Firefox's download actions.
• The next time you click on a jnlp file, Firefox will pop up a window asking you what to do. Choose open, and browse to your java installation directory. Enter the bin directory and choose the file named javaws.
• Click the checkbox to have Firefox open the jnlp file every time.