if (document.images) {

  // new button
  homeOn = new Image();
  homeOn.src = "/images/nav/home-ro.png"

  homeOff = new Image();
  homeOff.src = "/images/nav/home.png"

  // new button
  storeOn = new Image();
  storeOn.src = "/images/nav/store-ro.png"

  storeOff = new Image();
  storeOff.src = "/images/nav/store.png"

  // new button
  aboutOn = new Image();
  aboutOn.src = "/images/nav/about-ro.png"

  aboutOff = new Image();
  aboutOff.src = "/images/nav/about.png"

  // new button
  speaking_engagementsOn = new Image();
  speaking_engagementsOn.src = "/images/nav/speaking_engagements-ro.png"

  speaking_engagementsOff = new Image();
  speaking_engagementsOff.src = "/images/nav/speaking_engagements.png"

  // new button
  contactOn = new Image();
  contactOn.src = "/images/nav/contact-ro.png"

  contactOff = new Image();
  contactOff.src = "/images/nav/contact.png"

}

function changeImages() {
  // link syntax:
  // <a href="/xxx.php" onMouseOver="changeImages('xxx', 'xxxOn')" onMouseOut="changeImages('xxx', 'xxxOff')"><img src="/images/nav/xxx.png" alt="xxx" name="xxx" id="xxx" width="164" height="36" /></a>
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document.images[changeImages.arguments[i]].src = window[changeImages.arguments[i+1]].src;
    }
  }
}

function openNewWindow(theURL,winName,features) {
  window.open(theURL,winName,features);
}