You can update your joomla to the latest version using Extension manager.
On the administration interface go to Extensions / Extension Manager.
Click on Updates (next to Install), and click on Check updates button (upper right). You should get a list of components, languages and core that has a newer version released. (RaidPlanner also can be updated using this method)
This will update you Joomla to 2.5 which contains an updated version of the Javascript libraries. Hopefully that will fix your problem.
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