var visiblePane = 0;
var numPanes = 9;
var timer;
         
function start_rotator()
{
  timer = setTimeout("changePic()",10000);
}

function changePic()
{
  document.getElementById('pic_pane' + visiblePane).style.display = 'none';
  visiblePane = visiblePane + 1;
  if(visiblePane == numPanes)
    visiblePane = 0;
  document.getElementById('pic_pane' + visiblePane).style.display = 'block';
            
  clearTimeout(timer);
  timer = setTimeout("changePic()", 10000);
}
          
function changePicBack()
{
  document.getElementById('pic_pane' + visiblePane).style.display = 'none';
  visiblePane = visiblePane - 1;
  if(visiblePane < 0)
    visiblePane = numPanes - 1;
  document.getElementById('pic_pane' + visiblePane).style.display = 'block';
            
  clearTimeout(timer);
  timer = setTimeout("changePic()", 10000);
}