function imgOn(imgX) {
  img_now = 'bar_' + imgX + '_1'
  document.images[img_now].src = 'images/corner_top_left.gif';
  img_now = 'bar_' + imgX + '_2'
  document.images[img_now].src = 'images/bar_h_top.gif';
  img_now = 'bar_' + imgX + '_3'
  document.images[img_now].src = 'images/corner_top_right.gif';
  img_now = 'bar_' + imgX + '_4'
  document.images[img_now].src = 'images/bar_v_left.gif';
  img_now = 'bar_' + imgX + '_5'
  document.images[img_now].src = 'images/bar_v_right.gif';
  img_now = 'bar_' + imgX + '_6'
  document.images[img_now].src = 'images/corner_bottom_left.gif';
  img_now = 'bar_' + imgX + '_7'
  document.images[img_now].src = 'images/bar_h_bottom.gif';
  img_now = 'bar_' + imgX + '_8'
  document.images[img_now].src = 'images/corner_bottom_right.gif';
}

function imgOff(imgX) {
  for (counter=1; counter<9; counter++) {
    img_now = 'bar_' + imgX + '_' + counter
    document.images[img_now].src = 'images/tab_prog_sf.jpg';
  }
}