The Problem is that you include jQuery 1.9, in which the jQuery.browser was removed. Look at your functions.php, you will find a line in there saying wp_register_script or wp_enqueue_script with the parameter ‘jquery’.
The URL you are loading jQuery from is ‘http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js‘, and you have to change it to ‘http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js‘.
Please ask your developer to update your Fancyboxscript when he returns to your country 🙂