Did you put contingencies in your offer such as an inspection? And if so, when is that to be completed by.
Did you put a financing contingency in your offer and what is that date?
Many unanswered questions.
Also, keep in mind that although the banks will generally take their time getting an answer to, once they decide to go forward you can't move fast enough for them. Make sure you have all you ducks in row when dealing with short sales and foreclosed properties.