function flexToggle(el) {
  if (el.className == 'flex_open') {
    el.className = 'flex_shut';
    profileFlexAjax(el.id, 1);
  } else {
    el.className = 'flex_open';
    profileFlexAjax(el.id, 0);
  }
}

profileFlexAjax = function(elId, val) {
  var ajax = new Ajax()
  ajax.onDone = function() {
  }
  ajax.onFail = function() {
  }
  ajax.post('ajax/profile_flex_ajax.php', elId + '=' + val);
}