function preloadImages() {
  var imgs;
  if (document.images) {  //If images are turned on
    if (arguments.length > 0) { //If preload arguments are supplied then...
      imgs = new Array(arguments.length);
      var i = 0;
      for (i = 0; i < arguments.length; i++) {
        imgs[i] = new Image();
        imgs[i].src = arguments[i];
      }
    }
  }
}

function jumpToField(currentField, nextFieldName, maxLength) {
  if (currentField.value.length == maxLength) {
    eval("document.forms[0]." + nextFieldName + ".focus();");
  }
}

function setVisible(objectId, visible) {
  var element = document.getElementById(objectId);

  if (visible == true)
    display = "block";
  else
    display = "none";

  element.style.display = display;
}