[jQuery] how to know about previously selected li

[CreativeMind]

hi,
i m adding a class(e.g tab-selected) in li when i click/select or
hover the li, on hover the class is added and removed successfully.
but now when i click any other li, class is added successfully, how
can i remove the class which was added on previously selected li. how
can i know which li was previously selected/clicked and now has lost
the click event.
thx