Hey all,

I've been banging my head against a brick wall on this one for the last 12 hours, and the time has come for me to give up and consult the gurus on this one.

The below URL contains a login page, you can test it using the details
User: marco
Pass: polo

This seems to work PERFECTLY in opera, and it works in firefox but ONLY if I have firebug enabled. I don't care about IE for now, I'll...