function checkEnter(evt, form) {
  var keyCode = evt.keyCode ? evt.keyCode :
                evt.charCode ? evt.charCode :
                evt.which ? evt.which : void 0;

  if (keyCode == 13) {
    form.submitSearch.click();
    return false;
  } else {
    return true;
  }
}

function selectCheckBoxes(form, checked) {
  for (var i = 0; i < form.elements.length; i++) {
    var elem = form[i];
    if (elem.type == "checkbox") {
      elem.checked = checked;
    }
  }
}