You need to use a tripod or you need to put your camera on some solid ground to support your camera for night shots. If your picture is blurred, it is probably due to handshake due to the slow shutter speed. :bsmilie:
I agree with obewan that it is most probably due to handshake.
Blurriness due to out-of-focus and due to motion shake looks different. After a while, you will be able to tell which is which. It is important to distinguish between the two because the causes are different and hence the solution is different.