function search_by_tag(tag) {
  if ($('#q').val() == "") {
    $('#q').val(tag);
  } else {
    $('#q').val($('#q').val() + " " + tag);
  }

  perform_search();
}

function perform_search() {
  var term = $('#q').val();
  
  var location = "/foretag";
  
  if(term != "")
    location = location + "?q=" + term;
  
  window.location = location;
}