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) {
    button_agents_over = newImage("imgFiles/buttonAgentsOver.jpg");
    button_homeowners_over = newImage("imgFiles/buttonHomeownersOver.jpg");
    button_builders_over = newImage("imgFiles/buttonBuildersOver.jpg");
    button_inspectors_over = newImage("imgFiles/buttonInspectorsOver.jpg");
    button_warranty_over = newImage("imgFiles/buttonWarrantyOver.jpg");
    preloadFlag = true;
  }
}