There's a technique called 'stop motion animation'. Basically, you have to think in 'video mode'. Decide how long (length of time) will your whole clip be, and for each second, capture 12 pictures (12 photos instead of 24, for convenience sake. You can use your cam for that, but fix it onto a tripod, so that the camera doesn't move when you capture those pictures). While taking that 12 pictures/second, move the position of your mouse slightly, slowly towards the direction of where you want in to end up. For example, if you judged that the mouse needs 3 seconds to move from point A to B, there will be a total of 36 pictures captured, and the pictures should show the mouse slowly moving to the destination. Hope you understand what I wrote.
After taking all the pictures, import everything into a video editing software, piece up photo no.1 all the way to the last photo, and make sure each picture is repeated twice, so as to form 24 frames/second. Export the whole thing as a video clip.
Oh, remember to use manual mode or lock your exposure =)