This is a javascript error, caused by mootools. You can try to update your joomla installation to the latest version (use built in updater), or as a temporal workaround you can disable popup windows in RaidPlanner.
Also, you can try to update the jquery.js file in your template (you have 1.5.2, current release is 1.7.1): download this http://code.jquery.com/jquery-1.7.1.min.js and put it into templates/starwars/ with name jquery.js.
Please post if any of the above have worked for you.
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