Custom “confirm” dialog in JavaScript?

You might want to consider abstracting it out into a function like this:

function dialog(message, yesCallback, noCallback) {
    $('.title').html(message);
    var dialog = $('#modal_dialog').dialog();

    $('#btnYes').click(function() {
        dialog.dialog('close');
        yesCallback();
    });
    $('#btnNo').click(function() {
        dialog.dialog('close');
        noCallback();
    });
}

You can then use it like this:

dialog('Are you sure you want to do this?',
    function() {
        // Do something
    },
    function() {
        // Do something else
    }
);