Another preloader question

Hi folks,

Waht it is I have been trying for hours trying to figure out how I can add a bar that scales when loading a swf instead of just text that counts up. The fla is from a tutorial from a mag and what I can figure out the as for the loading of files is like this

in a key frame
percentloaded = 0;
percentage = “”;
sizetext = “”;
_root.shutterOpen=false;
loadtarget=_root.content;
loadMovie(_root.newContent,loadtarget);
totalbytes = -1;

next keyframe
if (loadtarget.getBytesTotal() == totalbytes) {
percentloaded = Math.floor(loadtarget.getBytesLoaded()/totalbytes*100);
percentage = percentloaded + “/100”;
if (percentloaded == 100){
gotoAndPlay(_currentframe+2);
}
}
totalbytes = loadtarget.getBytesTotal();
filesize=Math.floor(totalbytes/1000);
if(filesize>=0)sizetext=filesize+“K”;

next keyframe
gotoAndPlay(_currentframe-1);

thanks
R