I think the spanish are living in cloud cuckoo land if they believe that they can leave the eurozone, print trillions of pesatas to get them out of trouble and then pop back into eurozone at some later date.
At the moment they are between a rock and a hard place. If it was that easy to leave the eurozone they would have done so already because they know that their economy is suffering badly by being in it. They also know that the consequences of leaving may be as equally disasterous and perhaps more unpredictable. They should never have adopted the euro and the same applies to Greece.