(a) The juvenile board in Jack and Wise counties is composed of the county judges, the district judges in Jack and Wise counties, and the judge of each statutory county court in the counties that is designated as a juvenile court.
(b) The juvenile board shall elect one of its members as chairman at the beginning of each year.
(c) The commissioners courts shall pay the members of the juvenile board an annual salary in an amount set by the commissioners courts, payable in equal monthly installments out of the general funds or any other available funds of the counties.
(d) Unless the counties agree on a different method of allocating costs, each county shall pay the costs of the juvenile board in accordance with the ratio that the population of the county bears to the total population of the two counties.
(e) Section 152.0005(b) does not apply to the juvenile board in Jack and Wise counties.