Unplug it. Reach into the drum and try to turn it by hand. If you can turn it easily chances are the drive belt has broken or come off. If you can feel or hear the motor being turned then maybe motor has packed in or its starting capacitor. If it feels free then take off the back and have a look. The drive belt should be around the drum and the motor pulley if it;s damaged or broken a replacement shouldn't be more than a tenner from one of the spares suppliers on the net.
Kev the Fixer, November 2008