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Note: from now on please everyone refrain from calling JavaScript "Java." Beyond a resemblance in syntax the two are completely different and have no relation to each other whatsoever. This has an impact and is a very important distinction.

Now, Abi: the latter problem is almost certainly related to your popup blocker. Without getting overly technical (I could, but I don't see the point -- let me know if I need to explain myself further), The Firefox popup blocker is moderately intelligent about blocking "bad" popups and allowing "good" ones, but as this is a very difficult distinction to make it sometimes makes a false-positive. Try turning it off and see if that fixes things (I'd suggest turning it back on after you're done experimenting, however).

As for the first problem, I don't have the time at the moment to mess around with that site, but I highly suspect that it's a browser-related issue. If it works in IE chances are it's just a poorly-written feature which doesn't support Mozilla/Firefox.