function sendWarnings() {
  // Grab everything with the warning class name and add
  // it's value to an array.
  var warnings = $A();
  $$('.warning').each(function(el, i) {
    warnings.push(el.value);
  });

  // Post the warnings and display the response
  new Ajax.Request('ajax_send.php',  {
    method: 'post',
    parameters: { tst: $('tst').value, warnings: warnings },
    onSuccess: function(transport) {
      $('multi_send_rspnce').innerHTML = transport.responseText;
    }
  });
}