function right() {
    if (event.button == 2 || event.button == 3) {
      alert(
      "  BCD Corona & C. spa" + '\n' +
      "      (C)opyright 2007" + '\n' +
      "Applicazione by Artea snc");
         return false;
    }
    return true;
  }
  document.onmousedown=right;