Additional attributes to ajax events

[Brown, Berlin [GCG-PFS]]

With the onblur ajax calls, is it possible to add my own javascript .
  final AjaxFormComponentUpdatingBehavior blurText = new
AjaxFormComponentUpdatingBehavior("onblur") {           
   @Override
         protected void onUpdate(AjaxRequestTarget target) {
    checkPageNextLink(target);
         }
        };       
 
In the markup, can I simply add the onblur and it will get appended?
 
onblur="alert('update')"
 
How do I add the ajax call and then add my own javascript call?