Hello!
Seems there are some issues with registration here: http://clip2net.com/s/3k5z5WK.
When you click on radio input, it cause infinite loop(as I understand, error is in this line:
while (elemClass == null || elemClass.indexOf("tracking_") == -1)
), so your tab eat alot of cpu and doesn't process request.
Checked in Chrome and FF.
Thanks for your attention!
Best regards, Demogor.