function chart( wkn ) {
  
  var params = 'scrollbars=yes,location=no,menubar=no,personalbar=no,status=no,titlebar=no,toolbar=no';
  
  var window_d = window.open( '/chart/wkn-' + wkn + '/', 'chart', params + ',width=485,height=630' );
  window_d.focus();

  return false;
}