Twitter Bootstrap Popup ignores delay

Following this question here on stackoverflow, I created a twitter bootstrap popover that loads on hover. However, the delay is not used, the popover just shows immediately. Here's my code:

$('body').delegate('.withajaxpopover', 'hover', function(event) {
   if (event.type === 'mouseenter') {
      var el=$(this);
      $.get(el.attr('data-load'), function(d) {
      el.popover({delay: { 
                     show: 750, 
                     hide: 100
                  },
                  title: "MyTitle", 
                  content: d}).popover('show', 
                                       {delay: { show: 750, hide: 100 }});
                    });
   } else {
                    $(this).popover('hide');
   }
});
$('body').delegate('.withajaxpopover', 'click', function(event) {
   $(this).popover('hide');
});

The delay is just ignored. What can I do?

Thanks for your help or hints!