function setbkk24mimg (f) {
    img = document.getElementById('bkk24mbutton');
    img.src = f;
  }

  function bkk24mover () {
    setbkk24mimg ('images/bkk24_button_mouse_rollover.jpg'); 
  }

  function bkk24mout () {
    setbkk24mimg ('images/bkk24_button.jpg'); 
  }

  function bkk24mclick () {
    setbkk24mimg ('images/bkk24_button_mouse_click.jpg'); 
  }