function adjustVerticalPositioning() {
  var contentHeight = document.getElementById('content').offsetHeight;
  var imgHeight     = document.getElementById('flash_image').offsetHeight;

  if((contentHeight-imgHeight > 20)) {
    document.getElementById('flash_image').style.position = 'relative';
    document.getElementById('flash_image').style.top      = ((contentHeight-imgHeight) / 2) + 'px';
  }//if
}//adjustVerticalPositioning