Actionscript help

I am creating a flash site the loads 3 different swf files, one of the swf file has a loader in it to load photos, when I test the swf with the loader it works perfectly with this action script for the buttons: on (rollOver) {
_root.myLoader.contentPath = “kirsten_iness_High_key-copy.jpg”;
}

but when I test my main movie that loads the swf with the loader in it my photos do not show at all why is this happening? could someone give some help please.