function openwindow( link, w, h )
{
  toploc = screen.height / 2 - h / 2;
  leftloc = screen.width / 2 - w / 2;
  window.open( link, 'view_image', 'width=' + w + ',height=' + h + ',top=' + toploc + ',left=' + leftloc + ',scrollbars=no,location=no,status=no' );
}
function openwindow2( link, w, h )
{
  toploc = screen.height / 2 - h / 2;
  leftloc = screen.width / 2 - w / 2;
  window.open( link, 'view_property', 'width=' + w + ',height=' + h + ',top=' + toploc + ',left=' + leftloc + ',scrollbars=yes,location=no,status=no' );
}