Portfolio Slideshow Pro Javascript Void

I’m currently working on http://andrewnewson.co.uk where there is a new installation of Portfolio Slideshow Pro displaying 4 rotating feature images.

The problem is when mouse over of an image or bullet nav bottom left a Javascript Void(0) message shows in Firefox and Chrome. I’ve been through the following checks but am struggling to find the answer.

– Deactivating every plugin in turn, checking the slideshow each time
– Using the unedited TwentyTwelve theme
– Enabling force load of Jquery
– Different combinations of settings within Portfolio Slideshow Pro
– Checking footer.php

Any help would be greatly appreciated,

Thanks!