Well, when I try to go there, I get a message telling me I have the wrong username and password. Exactly what should happen. So I suspect the problem may be on the target page. Check any scripts there for the variable JSON - if you find it, remove that script.

I had this problem when doing some cross-browser testing. Some older browsers don't have JSON implemented natively. I can't find where I originally got the file, but this script will add in the functionality in browsers where it doesn't already exist. All you need to do is save the file to your site and load it into any page that requires JSON.

Hope this helps
-Scut

Browser: Mozilla Firefox 3.6.*

OS: Windows 7