$(document).ready(function() {
 var options2 = {
  target: '#results',
  beforeSubmit: loading,
  success: loaded  
 };
 $('#tuning_search').ajaxForm(options2);
});
function loading() {
 document.getElementById('loader').style.display='block';
 $('#marks').attr('disabled','disabled');
 return true;
};
function loaded() {
 document.getElementById('loader').style.display='none';
 $('#marks').removeAttr('disabled');
 return true;
};