function preloadImages() {

  if (document.images) {
    if (typeof(document) == 'undefined'){
      document = new Object();
    }
    document.loadedImages = new Array();
    var argLength = preloadImages.arguments.length;
    for(arg=0;arg<argLength;arg++) {
      document.loadedImages[arg] = new Image();
      document.loadedImages[arg].src = preloadImages.arguments[arg];
    }
  }
}

preloadImages(
'/img/front-buttons/on/prevention.gif',
'/img/front-buttons/on/treatment.gif',
'/img/front-buttons/on/patient-comfort.gif',
'/img/top-nav-on/contact-us.gif',
'/img/top-nav-on/directions.gif',
'/img/top-nav-on/faq.gif',
'/img/top-nav-on/home.gif',
'/img/top-nav-on/meet-the-doctor.gif',
'/img/top-nav-on/new-patients.gif',
'/img/top-nav-on/onice-tour.gif');