Load Random Movie Clips & Resize

I am pretty new to Flash. I read the tutorial on loading random movies and used the code provided in the tutorial, which worked very well, but I have a problem with the movie sizes. The code used was:

*filename = [“movie1.swf”,“movie2.swf”,“movie3.swf”];
path = “spiffs2/”;
i = filename.length;
k = Math.floor(Math.random()i);
loadMovie(path+filename[k], load_mc);

As you can see I am loading the 3 numbered movies from my “spiffs2” folder into an empty mc with an instance name of “load_mc”. My problem is that the 3 movies are all different sizes and I want them to adopt the dimensions of the empty movie clip, which is 150w by 100h.
I also tried the following code found in this forum after moving the 3 movies to the same folder:

var ad_number = 3; //number of movies
loadMovie(“banner”+random(ad_number)+".swf", _root.load_mc);
var ad_width = _root.load_mc._width;
var ad_height = _root.load_mc._height;
if (ad_width > 150) {
_root.load_mc._width = 150;
_root.load_mc._xscale = _root.load_mc._yscale;
} else if (ad_height > 100) {
_root.load_mc._height = 100;
_root.load_mc._xscale = _root.load_mc._yscale;
}

The movies load with this code also, but they do not resize as I expected.
Can someone please give me a hand with this? It’s probably a simple thing, but I have tried again and again and can’t find the answer anywhere.
Thanks in advance for any help!