Preload dynamically loaded jpgs?

Hi all,
I am working on a project that dynamically loads jpg images whose names are called from an external text file. I have it working well using the loadMovie() function, the only thing is that I would like to preload these images all at once and display a simple progress bar, then proceed to the first frame of my main scene.

I have no trouble with standard preloading practices, but this is the first time I've needed to preload dynamic elements. I found a page with some info on the subject at http://news.flashguru.co.uk/?aid=000044 , but I am a little(!) confused by it.

Here is the relevant portion of the code I have written so far:

****begin code

var whichtut
loadVarsText = new loadVars();
loadVarsText.load(whichtut + ".txt");
loadVarsText.onLoad = function(success) {
     if (success) {
          titlebox.html = true;
          titlebox.htmlText = this.title;
          instructions.html = true;
          instructions.htmlText = this.start;
          statusbox.html = true;
          statusbox.htmlText = "Step <b>"+[_currentframe-1]+"</b> of <b>"+this.numsteps+"</b>";
     } else {
          trace("error - text data not loaded");
     }

     //convert number of steps from text file to an integer
     numsteps=parseInt(this.numsteps);

     //if current step == total number of steps, disable "next" button
     if (numsteps == _currentframe-1) {
          nextbutton.enabled = false;
     } else{
          nextbutton.enabled = true;
     }    
_root.createEmptyMovieClip("graphic", 10);
graphic._x = 67;
graphic._y = 50;
thisgraphic = this.pic00;
loadMovie(thisgraphic, "graphic");

stop();

};
stop();

end code*****

As you can see, what I want to do is to preload the images that are loaded into the movieclip "graphic".

Please post any insight you might have into this issue.
Thanks in advance,
Kris M