Hey Andy,
You have multiple js erros:SyntaxError: missing ; before statement
div.slogin-clear{
slogin.css (line 1, col 16)
SyntaxError: expected expression, got ')'
});
index.p...=111264 (line 241, col 5)
ReferenceError: BTLJ is not defined
BTLJ(".btl-panel").css('float',btlOpt.ALIGN);
Also, it seems that you are using an old version of the comment system. Maybe updating to the latest comment version would magically ignore the other js issues on the page. (no guarantee though). Fixing the js errors would fix the comment system.
Regards,
Daniel