Scrolling thumbnail panel problem


I made a vertical scrolling thumbnail panel but i have a problem i can’t identify. From the index.swf i load gallery.swf inside a holder movie clip (which is in index.swf) and in gallery.swf is scrolling thumnail panel. Problem is that scrolling panel works just fine if you publish gallery.swf separately from index.swf, everything works smoothly like it should but if you publish index.swf then scrolling panel loaded inside it scroll’s slowly with halts and not the way it should. I attached SOURCE FILES and i would really appreciate if someone can take a look at this and help me find the problem?

thank you