(1)The elected members of the Zilla Panchayat referred to in clause (i) of section 117 shall as soon as may be, choose two members from amongst them to be respectively Adhyaksha and Upadhyaksha thereof and so often as there is a casual vacancy in the office of the Adhyaksha or Upadhyaksha, they shall choose another member from amongst them to be Adhyaksha or Upadhyaksha within a period of [sixty] [Substituted by the Amendment Act 11 of 2002.] days of occurrence of such vacancy as the case may be.