Budget estimates of the amount of appropriations needed each fiscal year for vocational rehabilitation services and for the administration of said program shall be submitted in such manner as may be provided by law, and sufficient funds for the purpose of carrying out the provisions of the Vocational Rehabilitation Law shall be appropriated by the legislature. In the event federal funds are available to the State of Mississippi for vocational rehabilitation purposes, the division of vocational rehabilitation is authorized to comply with such requirements as may be necessary to obtain said federal funds in the maximum amount and most advantageous proportion possible insofar as this may be done without violating other provisions of the state law and constitution. In the event the national congress fails in any year to appropriate funds for grants-in-aid to the state for vocational rehabilitation purposes, the state legislature shall appropriate such funds as may be necessary to carry out the provisions of said law.