function openwindow(w,h,url)
{
  var cw = 20, ch = 20, name='imagewindow';

  if (window.screen) 
  {
    cw = Math.floor((screen.availWidth-w)/2);
    ch = Math.floor((screen.availHeight-h)/2);
  }
  mywindow = window.open(url,name,'menubar=no,status=no,resizable=no,scrollbars=no,screenX='+ch+',screenY='+cw+',top='+ch+',left='+cw+',width='+w+',height='+h);
}

function openphoto(photo)
{
  var cw = 20, ch = 20, name='photowindow', w = 640, h = 600;

  if (window.screen) 
  {
    cw = 0;
    ch = 0;
    w = screen.availWidth;
    h = screen.availHeight;
  }
  photowindow = window.open('image.php?image='+photo,name,'menubar=no,status=no,resizable=yes,scrollbars=yes,screenX='+ch+',screenY='+cw+',top='+ch+',left='+cw+',width='+w+',height='+h);
}


function closewindow()
{
  window.close();
}