Capital gains

Hi Everybody,

I have to invest my funds invested in State bank of india capital gains avoidance Fixed deposit account  in a new construction within 3 years that is before 21.1.2012 to avoid 20% capital gains tax.

If i donot find a house or flat of my choice, by investing the funds in some Government of India bonds  (long term ) , will give me relief or i have to pay the tax.

Please someone help me sir

Thank You in advance