(VCR101)VANCOUVER, B.C., July 29--DECISION--Ovide Mercredi, current chief of the Assembly of First Nations, attends opening ceremonies of the 18th annual General Assembly of the First Nations in Vancouver Tuesday. Hundreds of native leaders from across the countrywill decide whether Mercredi should keep his job or be replaced. (CP PHOTO) 1997(str-Nick Procaylo)np