[jQuery] weird problem with remove or toggle Class

I ve just downloaded new version of jquery 1.2.1 and i tried to do sth like that menu zamknij login.html?form_action=logout wyloguj start.html start

[jQuery] weird problem with remove or toggle Class

I ve just downloaded new version of jquery 1.2.1 and i tried to do sth like that menu zamknij wyloguj start kontrahent