Thank you Sirji .. i did forget to mention that i do have a tripod and i use that always to take nightscape pic .. i will try the settings u suggest and see how it goes.First of all, buy a sturdy tripod. Without a tripod you cannot do night shooting.
For camera setting I suggest, keep manual ISO and set it to 200. Set your camera to manual focus, matrix metering and the exposure to Aperture priority. Set the aperture to f/8 and take a trial picture. If you find the exposure over or under, use the Exposure Compensation to correct the exposure.