How weird. Repeatedly?
I just tried on my housemates computer downstairs and it does the same thing.
As long as I'm not alone, then.
It's utterly mad- I thought it might be an image caching thing (the script works through image onLoads), but it turns out IE stops processing any Javascript you throw at it, even alert()s. Gaah.
test[doneimgs].src = image_url[doneimgs]+"?r="+Math.random();