Right hopefuly this is now cleared up because i have just bought a magical sword and this one comes with the spell Sucour Beast, i can click on the spell and the magical sword provides the mana for this spell not draining my mana.
It must be that my other weapons did not actualy have any spell with them even though they were magical <img src="/ubbthreads/images/graemlins/think.gif" alt="" /> Mmmm,seems a bit of a waste of time to have a magical weapon that doesn't do any magic though don't it????
Drink Up Ye Cider. 
