Don't copy this for the script copy from ON ENTER down.  The section in ON ALARM with  (ME GETSPOTSTATE 5 > IFELSE )  the number there should be one less than the number of pictures you are using.  and changing the numbers increases the speed of the animation.

ON ENTER {  10 ME SETALARM  }
ON ALARM { { 1 ME SETSPOTSTATELOCAL }
  { ME GETSPOTSTATE 1 + ME SETSPOTSTATELOCAL }
  ME GETSPOTSTATE 5 > IFELSE
  10 ME SETALARM
}