Update: I have tried to use ajax load method...

In IE8 everything works as expected, also in Opera and Chrome. In FF the button doesn't work at all, there is no file requester ;-( When I look at the code I see there is only a <button id=photoButton" onclick="return false">Upload</button>

I guess that is why it doesn't work, but why doesn't it make proper code in Firefox when the uploader is loaded ajax way?