What am I doing wrong?

This is the site. http://drader1.sasktelwebsite.net/children.html

The pictures seem to not load in the box the first time they are clicked on but after that they work properly. I know it is probably something obvious but I am completly missing it. Here is the link for the code.

drader1.sasktelwebsite.net/child.fla

Any help is greatly appreciated! Thanks