I found the following code on the internet. By using this code, a spinner is showed automaticly if an Ajax request is running. Very nice!
// registreer een algemene spinner Ajax.Responders.register({ onCreate: function() { if (Ajax.activeRequestCount > 0) Element.show('spinner'); }, onComplete: function() { if (Ajax.activeRequestCount == 0) Element.hide('spinner'); } });
Didn't know prototype had this global register method. I should take a better look at the API!