function getWidth()
{
  if (document.all) // Internet Explorer
    return document.body.clientWidth;
  else if (document.layers || document.getElementById)
    return window.innerWidth;
  return -1;
}
function moveLayerTo(layer, x, y)
{
  if (document.layers) // Netscape 4
    document.layers[layer].moveTo(x,y);
  else if (document.all) // Internet Explorer
  {
    document.all[layer].style.left = x;
    document.all[layer].style.top = y;
  }
  else if (document.getElementById) // IE 5 / 6 or NN 6
  {
    document.getElementById(layer).style.left = x;
    document.getElementById(layer).style.top = y;
  }
}
function centerLayer()
{
  win_width = getWidth();
  offset = (win_width > 730) ? Math.floor((win_width-725)/2) : 0;
  moveLayerTo('maintable', offset, 10);
  if (sec_flag)
    moveLayerTo('sectable', offset, 148);
  moveLayerTo('menubar_2', offset+196, 148);
  moveLayerTo('menubar_3', offset+305, 148);
  moveLayerTo('menubar_4', offset+457, 148);
}