Mrs. Ozzy,
It sounds like you don't quite understand what a short sale is intended for. I would tend to agree with the previous comments that if you could afford to buy a new home while still owning your current home, you probably won't qualify for a short sale. Short sales are for people in distressed situations that can no longer afford to make their mortgage payment due to some hardship, and they owe significantly more than what they could sell their home for.
Your best bet if you really want to buy a new home is probably to continue to try and rent your current home, even if you can't get enough to cover your mortgage payment.
Several other agents have said it already - You should speak with an attorney about what you are trying to do before getting caught up in something you may not be able to do. - Yesterday, 11:00