gistfile1.txt

document.observeSelect = function(){
  $$('select.get').each(function(element){
    if(!element.observingChange){
      element.observe('change', function(event){
        var e = event.element();
        if(e.isActive()){
          e.indicate();
          document.ajaxRequest(e, e.readAttribute('src'), 'get', event, e.serialize());
        }
      });
      element.observingChange = true;
    }
  });
};