actionscript 2.0 clueless

[dumdumsareyum]

I am trying to modify a flash/actionscript template with about 0 knowledge of actionscript. I have identified the problem, but don't know enough to fix it. I will try to explain.  There are 4 photo galleries with thumbnails and the paths to the images are identified in an xml file.  The problem is that when the user selects a new photo gallery that does not have as many images as the prior gallery they viewed, the thumbnails from the prior gallery are not removed. For example, if they view a gallery with 10 images and then view a gallery with 8 images, the last 2 thumbnail images(which are technically movie clips) from the first gallery remain on the screen.

 

var createThumb = function(num:Number){
var path:MovieClip = gallery.bigIm.thumb;
var mask:MovieClip = gallery.bigIm.thumb.mask;
var bgr:MovieClip = gallery.bigIm.thumb.bgr;
var pathMove:MovieClip = gallery.bigIm.thumb.cont;
var thArr:Array = _root.getThPath(num);

    pathMove._x = 0;
_root.numberImages = thArr.length;

for (var j:String in path.gall){
	path.cont[j].removeMovieClip();
}

(function continues....)

 

So, I don't know how the for(var:String in path.gall){ path.cont[j].removeMovieClip();}  loop works, it doesn't look like any for loop i'm used to seeing....Let me what other information is necessary to solve my issue.....Thanks!