Element.Events.extend({
	'wheelup': {
		type: Element.Events.mousewheel.type,
		map: function(event){
			event = new Event(event);
			if (event.wheel >= 0) this.fireEvent('wheelup', event)
		}
	},
 
	'wheeldown': {
		type: Element.Events.mousewheel.type,
		map: function(event){
			event = new Event(event);
			if (event.wheel <= 0) this.fireEvent('wheeldown', event)
		}
	}
});
 

function startWheel() {
$('content').addEvents({
	'wheelup': function(e) {
		e = new Event(e).stop();
		window.scrollBy('-150',0);	
	},
 
	'wheeldown': function(e) {
		e = new Event(e).stop();
 		window.scrollBy('150',0);
	}
});
}
window.addEvent('domready', startWheel)