I would probably use a GUI toolkit like TGUI or SFGUI since SFML doesn't have anything built in to do it easily. I'm sure you can do it manually by capturing mouse focus, using events, etc.. but a GUI lib would be much easier.
Side note: Why 1.6?
thanks ill take a look. are they easier to use/install than qt? im writing it in 1.6 because my friend needed this one time thing really quickly, and since i never used sfml i wanted to do it that way because it was easiest