Section 15a.

A justice of the court of special sessions of the city of New York or a justice of the municipal court of the city of new York may be assigned temporarily, without change in his compensation, to hold a trial or special term of the city court of the city of new York in any county upon an order of a majority of the justices of the appellate division in the judicial department to which the assignment is made, if in their opinion there is need for the assignment and there is no likelihood of serious prejudice to the court from which the justice is assigned. No temporary assignment of any justice for service outside his judicial department shall be made unless a majority of the justices of the appellate division in his department consent thereto. A justice while temporarily assigned shall have the powers, duties and jurisdiction of a justice of the city court. No temporary assignment of any justice for service outside his court shall affect his existing office or create a vacancy therein.