I searched google for 'free .GIF creator', and downloaded one of the hundreds of programs that came up. I think mine's called AGif or something. I wouldn't recommend it. It's slow, has a clumsy interface, and although you can't really see it at this size, for some reason some groups of pixels turn white. I think most programs like this work in much the same way i.e. drag and drop photos into a timeline, then adjust the time each is shown for, and the looping. It took me about 30 seconds to work it out, so you should be fine. Just play with it until you get the effect you want. Good luck.