function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    fsf_nav_01_fsf_nav_02_over = newImage("/images/nav/fsf_nav_01-fsf_nav_02_over.gif");
    fsf_nav_02_over = newImage("/images/nav/fsf_nav_02-over.gif");
    fsf_nav_03_fsf_nav_04_over = newImage("/images/nav/fsf_nav_03-fsf_nav_04_over.gif");
    fsf_nav_04_over = newImage("/images/nav/fsf_nav_04-over.gif");
    fsf_nav_05_fsf_nav_06_over = newImage("/images/nav/fsf_nav_05-fsf_nav_06_over.gif");
    fsf_nav_06_over = newImage("/images/nav/fsf_nav_06-over.gif");
    fsf_nav_07_fsf_nav_08_over = newImage("/images/nav/fsf_nav_07-fsf_nav_08_over.gif");
    fsf_nav_08_over = newImage("/images/nav/fsf_nav_08-over.gif");
    fsf_nav_09_fsf_nav_10_over = newImage("/images/nav/fsf_nav_09-fsf_nav_10_over.gif");
    fsf_nav_10_over = newImage("/images/nav/fsf_nav_10-over.gif");
    fsf_nav_11_fsf_nav_12_over = newImage("/images/nav/fsf_nav_11-fsf_nav_12_over.gif");
    fsf_nav_12_over = newImage("/images/nav/fsf_nav_12-over.gif");
    fsf_nav_13_fsf_nav_14_over = newImage("/images/nav/fsf_nav_13-fsf_nav_14_over.gif");
    fsf_nav_14_over = newImage("/images/nav/fsf_nav_14-over.gif");
    fsf_nav_15_fsf_nav_16_over = newImage("/images/nav/fsf_nav_15-fsf_nav_16_over.gif");
    fsf_nav_16_over = newImage("/images/nav/fsf_nav_16-over.gif");
    preloadFlag = true;
  }
}