function getlesson() {
  //get lesson
  mylesson = document.getElementById("lesson").value;
  
  //build lesson url
  lessonloc = '/support_downloads/files/win/standards/StandardsDB ' + mylesson + '.prs';

  //download file
  document.lessonform.action = lessonloc;
  document.lessonform.method = 'get';
}