(a) The administrator and all other necessary personnel of the shelter care home and detention home, shall be appointed by the Chief Judge of the Circuit Court or any Judge of that Circuit designated by the Chief Judge, to serve at the pleasure of the appointing authority. Each shall receive a monthly salary fixed by the county board. Personnel shall also be reimbursed for their actual and necessary expenses incurred in the performance of their duties. The expenses shall be reimbursed at least monthly upon proper certification by the court. The supplies or repairs necessary to maintain, operate and conduct the shelter care home and the detention home shall be furnished upon the requisition of its administrator to the chairman of a committee as may be designated by the county board, and the bills therefor shall be audited, passed upon and paid as other bills for supplies furnished for county institutions.