Check out the Fancybox source code and replace the code marked with the if ($.fn.mousewheel) {...}following text (Completely modified code can be found here ).
if ($.fn.mousewheel) {
wrap.bind('mousewheel.fb', function(e, delta) {
if (!busy && $(e.target).get(0).clientHeight == 0 || $(e.target).get(0).scrollHeight === $(e.target).get(0).clientHeight) {
e.preventDefault();
$.fancybox[ delta > 0 ? 'prev' : 'next']();
}
});
}
Fancybox Fancybox- . , .