// JavaScript Document

  var aryImages = new Array(2);

  aryImages[0] = "images/header_left01.jpg";
  aryImages[1] = "images/header_left02.jpg";
  aryImages[2] = "images/header_right01.jpg";
  aryImages[3] = "images/header_right02.jpg";
  aryImages[4] = "images/header_left_over01.jpg";
  aryImages[5] = "images/header_left_over02.jpg";
  aryImages[6] = "images/header_right_over01.jpg";
  aryImages[7] = "images/header_right_over02.jpg";

  for (i=0; i < aryImages.length; i++) {
    var preload = new Image();
    preload.src = aryImages[i];
  }

  function swap(imgID, imgIndex) {
   document.getElementById(imgID).src = aryImages[imgIndex];
  }