function handle(delta) {
	var speed = 750;
	if (delta < 0) {
		//down
		dw_scrollObj.initScroll('wn','down');
		setTimeout("dw_scrollObj.stopScroll('wn'); dw_scrollObj.resetSpeed('wn');", speed)
	} else {
		//up
		dw_scrollObj.initScroll('wn','up');
		setTimeout("dw_scrollObj.stopScroll('wn'); dw_scrollObj.resetSpeed('wn');", speed)
	}
}

function wheel(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;
	}
	if (delta) {
		handle(delta);
	}
}

/* Initialization code. */
if (window.addEventListener) {
	window.addEventListener('DOMMouseScroll', wheel, true);
}
window.onmousewheel = document.onmousewheel = wheel;