Java installed but page doesn't load.

This is the page I'm trying to browse... http://freechess.org/Login/jin/index.php

I'm mainly using Firefox, however I also have Maxthon (Cloud) and SeaMonkey installed.

I get an error that I do not have Java (which I do), so, I updated the three Java apps available for download and again get the "Java not installed" and a pop up box saying the application has been blocked due to my security settings.

AFAIK I've never changed any Java settings, and can't find a launcher for Java in the Portable Apps launch box.

The same fault / error message occurs across all three browsers (yeh yeh, SeaMonkey and FireFox have similar pasts)

I really only need to login the once to change the temporary password, then plan to use the downloaded game (which I've added to the PA dir on my USB).

Thanks for looking.