The mayor shall in writing, appoint judges pro tem, who shall act in the absence or disability of the regular judge of the municipal court, or subsequent to the filing of an affidavit of prejudice. The judges pro tem shall qualify to hold the position of judge of the municipal court, as provided herein. The municipal court judge pro tem shall receive compensation equal to that of the regular municipal court judge, prorated to the actual days of service as a judge pro tem. The term of employment of judges pro tem shall be specified in writing, but shall in any event not extend beyond the term of the appointing mayor.