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) {
    news_over = newImage("images/news_over.gif");
    now_over = newImage("images/now_over.gif");
    soon_over = newImage("images/soon_over.gif");
    notes_over = newImage("images/notes_over.gif");
    about_over = newImage("images/about_over.gif");
    preloadFlag = true;
  }
}

function comeBack(url) {
  if (opener) {
    if (opener.closed)
      window.open(url, "");
    else if (opener.location.href.search(url) == -1)
      opener.location.href = url;
    self.close();
    return false;
  }
  return true;
}