$(document).ready(function() { 
        $("a.iframe").each( function() {
                $(this).fancybox({ 
                        'zoomSpeedIn'  : 500, 
                        'zoomSpeedOut' : 0, 
                        'zoomSpeedChange' : 0,
                        'overlayShow'  : true,
                        'overlayOpacity' : 0.4, 
                        'hideOnContentClick': false,
                        'frameHeight' : (($(this).attr('rel'))?parseInt($(this).attr('rel')):500),
                        'frameWidth' : 700,
                        'hideTitle':true
                });
        });
});