Sprite Animation

I have a following problem:
A group of sprites (I’m using modifyed Sprites
from GFX with SDL (by Marius))
They all have same number of frames and frame timings but when their
animaton runs for a long time each sprite animation is played different
form others.

Need a idea how to make them to be played synchroniusly?

10x in advance!
And I apologize for my poor english… I hope to understand me