Any idea what the optionTracking array is used for in the mcq model? And what does index() refer to? And how come there are two prototypes? What does the second one do? Cheers, Paul -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.nottingham.ac.uk/pipermail/xerte/attachments/20091009/42f2f0a9/attachment.html