I try to use more of the parameters but could not get it working with <g:helpBalloon title="foo" content="bla" useEvent="['mouseover']" /> should result in <script type="text/javascript"> new HelpBalloon({ title: 'foo', content: 'bla', useEvent: ['mouseover'] }); </script> but useEvent="['mouseover']" seems not to be recognized?! as seen on http://www.beauscott.com/examples/help_balloons/doc/examples.htm