ActionScript 2.0 :: Repeat A For Loop From Start

I've got a game going where portals are randomly placed across the map every X seconds.However, I can't figure out how to stop the portals from spawning on top of each other. I know how to easily do the collision, and check if they're too close to each other.Pretty much what I do is create the portal object, then randomly assign it X and Y values. Then, I do a for loop that loops through all the portals in the portals array, check THEIR X and Y value, checks to see if they're too close...then what? I can't just go "okay, it's too close" and randomly assign it new X and Y values, otherwise it could be on top of ANOTHER portal.What I'm looking for is something that will check the X and Y values of all the portals, then if it is on top of another portal, it will assign new X/Y values. Then, if these are on top, it will do it again. And again, until it gets the job done!