Javascript in IE

Nathan Vander Wilt has been helping me with my Javascript for Quisition in IE.

From him I've learnt a couple of key things recently:

• don't name your variables the same as your element IDs
• ['a', 'b', 'c', 'd',] has 4 elements in Firefox and Safari but 5 in IE (note the final comma)

Thanks Nathan! I've now (hopefully) fixed the Quisition Short-Term Test Demo for IE users.

I still have some suggestions from Tim Wegener to implement.