Mousemove events have no event target in IE8

[qris]

This is probably an IE8 bug/limitation, but jQuery seems to work around it.

I'm trying to use the Chosen component with jQuip instead of jQuery. It seems to mostly work (apart from getting a 0px size initially, that I had to override manually), but mouse events don't work and generate an error, as you can see on this screenshot:

It seems that event.target is undefined for these events. Any ideas where can we get this from? Can jQuip work around this IE8 bug as jQuery does?