EMPLOYEE ASSISTED ANOTHER EMPLOYEE WITH THE LOADING OF STEEL BEAMS--THAT WERE LYING FLAT ON PAVEMENT THAT MORNING--ONTO A FORKLIFT. LATER THAT DAY, HIS BACK BEGAN TO ACHE & BECAME WORSE OVER THE NEXT COUPLE OF DAYS. HE WORKED 6/25 AND 6/26 AND WENT TO THE DOCTOR ON 6/28/00.