/* prototype.js with mouse wheel event.
 * MIT license.
 *
 * gorou <hotchpotch(at)gmail.com>
 * http://rails2u.com/
 */

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;	}
		//Pour bloquer la barre du navigateur
		if (event.preventDefault) {
        	event.preventDefault();
		}
		event.returnValue = false;
		return Math.round(delta); //Safari Round
	}

});