Importing from Particle Illusion or Combustion. Help please

Effects can be imported to Flash from Particle Illusion or Combustion as a series of images and these can be put in a MC in flash.
My question is how we can a smooth and continuously running effect in flash. For instance in Particle Illusion you create a smoke wich comes from a given point. In flash when it reaches the end point it comes back to the begining and the effect doesn’t go on continuously.
Any help on this please?