Why do you need to display this from the code behind? The user will initiate an action on the client, which is where this should be done.
If you're trying to put this on a delete button or something that's auto-generated:
$('.delButton').click(function(){
jConfirm('Can you confirm this?', 'Confirmation Dialog', function(r) {
jAlert('Confirmed: ' + r, 'Confirmation Results');
});
}
where .delButton is a class you could add to your delete buttons (or you can do whatever else you need to find which ones you attach this to). if you need you can also put the .live in there so jQuery will auto-hook up on new elements.
After the click, the inner jAlert can be removed and you can do your other logic inside.