Adding relative paths to a Flash action script for random image display

I found a solution here on this forum, but it isn't quite as flexible as I need it to be.  I suspect the fix is rather simple, but I need some help.  This script was offered on another solved topic (Q_21635201.html), but I'll include it here too (my question follows).  In a nutshell, it loads images from a specified directory and cycles through them randomly.  My application here is a header/banner image.

To see this working without doing anything with the code, in the same directory as the published swf, you need a directory "images" and then 4 jpg images numbered img1.jpg / img2.jpg / img3.jpg / img4.jpg.

var mc_container:MovieClip = this.createEmptyMovieClip("mc_container", 0);
// highest numbered img
var highest_num:Number = 4;
var directory:String = "images/";
var naming:String = "img";
// create the image array
var imgArr:Array = new Array();
// for positioning purposes
var img_width:Number = 370;
var img_height:Number = 170;
var interval:Number;
function populateArr(Void):Void
{
      for (var i = 1; i<=highest_num; ++i)
      {
            var img_name:String = directory+naming+i+".jpg";
            imgArr.push(img_name);
      }
}
populateArr();
var currentclip_mc:MovieClip;
var fade_rate:Number = 5;
var firstone:Number = 0;
var count:Number = 0;
function loadImg(mc:MovieClip):Void
{
      clearInterval(interval);
      count++;
      var imgobj:Object = getrange();
      var imgtoload:String = imgobj.imgtoload;
      var depth:Number = imgobj.depth;
      // Load img
      var img_mc_container:MovieClip = mc_container.createEmptyMovieClip("img_mc_container"+count, count);
      var img_load:MovieClip = img_mc_container.createEmptyMovieClip("img_load", 0);
      img_load.loadMovie(imgtoload);
      img_mc_container.currentclip_mc = mc;
      // Center on stage
      img_mc_container._x = (Stage.width-img_width)/2;
      img_mc_container._y = (Stage.height-img_height)/2;
      // hide
      img_mc_container._alpha = 0;
      img_mc_container.onEnterFrame = function()
      {
            if (this.img_load.getBytesLoaded() != 0 && this.img_load.getBytesLoaded() == this.img_load.getBytesTotal())
            {
                  if (this._alpha<100)
                  {
                        this._alpha += fade_rate;
                  }
                  if (firstone>0)
                  {
                        if (this.currentclip_mc._alpha>0)
                        {
                              this.currentclip_mc._alpha -= fade_rate;
                        }
                        else if (this.currentclip_mc._alpha<=0)
                        {
                              this.currentclip_mc.removeMovieClip();
                              interval = setInterval(loadImg, 3000, this);
                              delete this.onEnterFrame;
                        }
                  }
                  else
                  {
                        if (this._alpha>=100)
                        {
                              interval = setInterval(loadImg, 3000, this);
                              firstone++;
                              delete this.onEnterFrame;
                        }
                  }
            }
      };
}
// this function just returns a number between 2 numbers, in this case 0 and myarray's length - 1
function getrange(Void):Object
{
      // length of null array  
      var min:Number = 0;
      // top of the array containing data is always [array length] - 1
      var max:Number = imgArr.length-1;
      var randnum:Number = Math.round(Math.random()*(max-min+1)+(min-.5));
      // get rid of the selection so can't do it again
      var imgtoload:String = imgArr[randnum];
      trace(imgArr[randnum]);
      imgArr.splice(randnum, 1);
      var obj:Object = ({imgtoload:imgtoload, depth:randnum});
      if (imgArr.length<1)
      {
            populateArr();
            for (var i = 0; i<imgArr.length; ++i)
            {
                  if (imgArr[i] == imgtoload)
                  {
                        imgArr.spice(i, 1);
                        break;
                  }
            }
      }
      return obj;
}
// Start App
loadImg();


This script is exactly what I was looking for, but I have encountered one problem with it that I'm hoping someone can help me with.   When I insert the flash file containing this code into my html page, the flash file displays just fine, except that the random image display aspect of it only works if the html file resides in the same physical directory as the .swf file.   This is a bit of a problem because I'd like to include the .swf file in other pages at other levels of my site hierarchy.  But apparently the script looks for the random image folder relative to the html file rather than relative to the .swf file that actually references it.   Does anyone have any tips for how I could resolve this?