function wo (linker, rechter) {
  window.open(linker, 'help');
  if ( rechter.length > 0 ) {
    window.open(rechter, 'doen');
  }
  return false;
}

function iwo( dir, linker, rechter ) {
  window.open( dir + 'keuze.html', 'keuze' );
  window.open( dir + linker, 'help' );
  if( rechter.length > 0 ) {
    window.open( dir + rechter, 'doen' );
  }
  return false;
}

function popit(theURL,winName,w,h) {
  window.open(theURL,winName,'fullscreen=no,titlebar=false,scrollbars=no,width=w,height=h');
  return true;
}