Accessory Belt Keeps Getting Thrown Off

serpentine belt or ribbed v for power steering. check it. Take a flash light and check crankcase pulley or also known as harmonic balancer which also holds accessory belts. Probably the tension needs to be adjusted so it is tight enough. loosen adjusting bolt. Once desired tension is met, tighten adjusting bolt and check again. Need correct tools. There are a few people or shops who I would let touch my car if I had too after I have owned and been involved with owning a fast eclipse. Why I do all work. I cannot believe they said replace idler. There is tensioner pulley and idle pulley which timing belt goes around. They must be on LCD OR SMOKIN POT.