Who has the biggest brain?

let's see you has the big brains?  What is wrong with my code.  Why does the bytes come back undefined...

var movieArray = ["volume.swf", "yellowdogworks.swf", "main.swf", "pricing.swf", "gallery.swf"];
var i = 0;

while(i < 5){
     loadMovie(movieArray[i], _root);
     trace(i);
     trace(movieArray[i]);

     bytesLoaded = eval(_root.getBytesLoaded());
     bytesTotal = eval(_root.getBytesTotal());
     trace(bytesLoaded);
     trace(bytesTotal);
     
     if (bytesTotal > 0 && bytesTotal == bytesLoaded){
          movieArray[i].stop();
          trace("stop");
          i++;
     }
     getURL("index.htm");
}