Object.extend(Event, {
        wheel:function (event){
                var delta = 0;
                if (!event) event = window.event;
                if (event.wheelDelta) {
                        delta = event.wheelDelta/120;
                        if (window.opera) delta = -delta;
                } else if (event.detail) { delta = -event.detail/3;     }
                return Math.round(delta); //Safari Round
        }
});
function handleMouse(e){
	$('book').mousewheelHandler(Event.wheel(e));
}

Event.observe(document, "mousewheel", handleMouse, false);
Event.observe(document, "DOMMouseScroll", handleMouse, false); // Firefox