Timer()

I have downloaded a slideshow xml example to load .swf files

Here’s example that I downloaded: http://simplistika.com/as3-xml-thumbnail-photo-gallery/

I have modified and added an extra set interval timer() with a delay time which is working BUT my problem when user clicked on one of thumbnail, I want to be able to stop timer delay running and start back on the RIGHT thumbnail to play.

Does anyone know how to do that?