Unless otherwise provided in the resolution of the directors of the authority authorizing the issuance of the bonds, all pledges of appropriated funds made by the authority shall be on a parity so that all bonds of the authority secured by a pledge of appropriated funds shall be equally and ratably so secured without regard to time of issuance. Bonds issued by the authority shall be construed to be negotiable instruments, although payable solely from a specified source, as provided herein.
Ala. Code § 41-10-755 (1975)