I am going to disagree witht hte majority here. You must check your JD and contract regarding other work. Depending on what the jos are, they may have a clause either barring you from doing other work, or restricitng the types of other work you can do (for example would you want someone who was a ploiceman moonlighting as a bouncer? in my profession (nurse) someone got struck off for being photographed in her work uniform for a modelling campaign to do with hunting)