Exit without cancelling Visa

Hi,
I Exit Qatar January'2011 without cancelling visa, that time visa validity was till 20thFebruary'2011; please advise when I can go for visa. Before completing 2 years(4 months left to complete) shall I come on visit or business visa; then how/when I can go fo emplyment visa.
Thanks & Regards,
Indian007
If you do not have cancel stamped in your passport, you can come back after 6 months.