[jQuery] Not work opacity in jQuery 1.3.1 and opera 9.2

[NeX]

Can anyone help me?
In jQ 1.3.1 and opera 9.23 i can't change opacity of element with $
("id").css({opacity: 1});
In jQ 1.2.6 all works fine.
Is there bug of jQ?

Example http://new.globalres.ru/index.html