var aryImages = new Array(2);
//etk rollover
aryImages[0] = "assets/ETKSteps/hiw-step1.jpg";
aryImages[1] = "assets/ETKSteps/hiw-step2.jpg";
aryImages[2] = "assets/ETKSteps/hiw-step3.jpg";
aryImages[3] = "assets/ETKSteps/hiw-step4.jpg";
aryImages[4] = "assets/ETKSteps/hiw-step5.jpg";
aryImages[5] = "assets/ETKSteps/hiw-step6.jpg";
aryImages[6] = "assets/ETKSteps/hiw-step7.jpg";
aryImages[7] = "assets/ETKSteps/hiw-step8.jpg";
aryImages[99] = "assets/etk-placeholder.jpg";
//letk rollover
aryImages[20] = "assets/hiw-step1.jpg";
aryImages[21] = "assets/hiw-step2.jpg";
aryImages[22] = "assets/LETKSteps/hiw-step3.jpg";
aryImages[23] = "assets/LETKSteps/hiw-step4.jpg";
aryImages[24] = "assets/LETKSteps/hiw-step5.jpg";
aryImages[25] = "assets/LETKSteps/hiw-step6.jpg";
aryImages[26] = "assets/LETKSteps/hiw-step7.jpg";
aryImages[27] = "assets/LETKSteps/hiw-step8.jpg";
aryImages[299] = "assets/letk-placeholder.jpg";

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

function swap(imgIndex) {
  document['imgMain'].src = aryImages[imgIndex];
}