function open_wnd( lpLink ) {
  var w = window.open( lpLink, 'POPUP', 'width=800,height=600,resizable=yes,scrollbars=yes' );
  w.focus();
}

function open_print() {
  var lpLink = self.location.href;
  if( lpLink.indexOf( '?' ) != -1 ) {
    lpLink += '&print_version=1';
  } else {
    lpLink += '?print_version=1';
  }
  open_wnd( lpLink );
}