Also, do you even know if your lender would allow you to do a short sale? Are you currently behind on your payments and are you on the verge of being foreclosed on? Why do you need to sale?
Short sale should be one of a person's last resorts before the property going into foreclosure. It shouldn't just be an routine decision made when you decide that you're tired of living at your currently location and you're upside-down with the mortgage. In my opinion, this is part of what's so wrong with this country right now.