Flash 8 AS2 Please help!

Trying to build a gallery where the main box’s image replaces the thumbnail and has an effect applied to it and I sort of managed it, but after several clicks or clicking more than once on the same thumbs, another image gets the tween. I guess I have to play around with the image’s id to achieve what I need, but I’m stuck. I figured maybe assigning values to the ids would help, but I keep messing this up… How can I do it to make the id’s variable change on loading the new image?

thanks for the patience