I don't know final year of what, but shouldn't you have acquired at least the skill to understand the basics of your project and do basic research? A related question that pops up immediately is, what made you choose the Arduino for such a project? Was it a given or did you choose it without understanding the problem?
Now, I guess you sit there and wonder cluelessly what earned you such a comment from a stranger.
What your research should have uncovered - if you had spent the time to do it - is that your interface needs present itself on the USB as HID device of the subclass mouse and provide the messages defined for this class. Look for the defintion or at least a sample program to see what's necessary, then match it to what you have available from your accelerometers.
And if you have any understanding of the Arduino, you should know that the USB-driver on the Arduino Duemilanove is a FTDI-chip, which presents itself only as a serial port USB-device and not a HID. On the Uno, you can reflash the USB-controller to do other things, but that's not a beginner project either. On the whole, you'd better have chosen a platform which allows you to play HID directly - stuff like the Teensy or Atmel USBKey. There are other less appealing alternatives available for the Arduino, but I leave it you to discover them on your own.
I hope, this posting gives you enough keywords to research in Google to set you on the right track. Most of them lead you directly to relevant pages. Or do you need someone to type that into Google for you too?
Korman