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) {
    p01_08o1 = newImage("images/p01_08o1.jpg");
    p01_08o2 = newImage("images/p01_08o2.gif");
    p01_08o3 = newImage("images/p01_08o3.jpg");

    p02_04o1 = newImage("images/p02_04o1.gif");
    p02_04o2 = newImage("images/p02_04o2.jpg");
    p02_04o3 = newImage("images/p02_04o3.gif");
    p02_04o4 = newImage("images/p02_04o4.gif");
    p02_04o5 = newImage("images/p02_04o5.gif");

    p03_04o = newImage("images/p03_04o.gif");
    preloadFlag   = true;
  }            
}