Preload 50% of site with lostinbeta's preloader

Hello,
I have been searching and I know that it is possible to only load a portion of a site with a preloader. I was wondering if anyone knows how I can do this with lostinbeta’s preloader from the tut on this site?

The reason I want to do this is because the site is for a photographer and the portfolios take awhile to load, if I load half the portfolio by the time you get to the second half it will be loaded anyway, so why have people wait for the entire portfolio to load.

By the way, I wanted to thank lostinbeta for a great tut, the preloader works great and the tut was easy to understand even for a newbie such as myself!
Below is the code from the tut…

bytes_loaded =
Math.round(this.getBytesLoaded());
bytes_total =
Math.round(this.getBytesTotal());
getPercent = bytes_loaded/bytes_total;
this.loadBar._width = getPercent186.9;
this.loadText = Math.round(getPercent
100)+"%";
if (bytes_loaded == bytes_total) {this.gotoAndPlay(3) ;
}

Thanks!
–christina