function init() {
	if (!document.body) return;
	var e = document.body,
		t = document.documentelement,
		n = window.innerheight,
		r = e.scrollheight;
	root = document.compatmode.indexof("css") >= 0 ? t : e;
	activeelement = e;
	initdone = !0;
	if (top != self) frame = !0;
	else if (r > n && (e.offsetheight <= n || t.offsetheight <= n)) {
		var i = !1,
			s = function() {
				if (!i && t.scrollheight != document.height) {
					i = !0;
					settimeout(function() {
						t.style.height = document.height + "px";
						i = !1
					}, 500)
				}
			};
		t.style.height = "";
		settimeout(s, 10);
		addevent("domnodeinserted", s);
		addevent("domnoderemoved", s);
		if (root.offsetheight <= n) {
			var o = document.createelement("div");
			o.style.clear = "both";
			e.appendchild(o)
		}
	}
	if (document.url.indexof("mail.google.com") > -1) {
		var u = document.createelement("style");
		u.innerhtml = ".iu { visibility: hidden }";
		(document.getelementsbytagname("head")[0] || t).appendchild(u)
	}
	if (!fixedback && !disabled) {
		e.style.backgroundattachment = "scroll";
		t.style.backgroundattachment = "scroll"
	}
}

function scrollarray(e, t, n, r) {
	r || (r = 1e3);
	directioncheck(t, n);
	if (acceleration) {
		var i = +(new date),
			s = i - lastscroll;
		if (s < acceldelta) {
			var o = (1 + 30 / s) / 2;
			if (o > 1) {
				o = math.min(o, accelmax);
				t *= o;
				n *= o
			}
		}
		lastscroll = +(new date)
	}
	que.push({
		x: t,
		y: n,
		lastx: t < 0 ? .99 : -0.99,
		lasty: n < 0 ? .99 : -0.99,
		start: +(new date)
	});
	if (pending) return;
	var u = e === document.body,
		a = function() {
			var i = +(new date),
				s = 0,
				o = 0;
			for (var f = 0; f < que.length; f++) {
				var l = que[f],
					c = i - l.start,
					h = c >= animtime,
					p = h ? 1 : c / animtime;
				pulsealgorithm && (p = pulse(p));
				var d = l.x * p - l.lastx >> 0,
					v = l.y * p - l.lasty >> 0;
				s += d;
				o += v;
				l.lastx += d;
				l.lasty += v;
				if (h) {
					que.splice(f, 1);
					f--
				}
			}
			if (u) window.scrollby(s, o);
			else {
				s && (e.scrollleft += s);
				o && (e.scrolltop += o)
			}!t && !n && (que = []);
			que.length ? requestframe(a, e, r / framerate + 1) : pending = !1
		};
	requestframe(a, e, 0);
	pending = !0
}

function wheel(e) {
	initdone || init();
	var t = e.target,
		n = overflowingancestor(t);
	if (!n || e.defaultprevented || isnodename(activeelement, "embed") || isnodename(t, "embed") && /\.pdf/i.test(t
		.src)) return !0;
	var r = e.wheeldeltax || 0,
		i = e.wheeldeltay || 0;
	!r && !i && (i = e.wheeldelta || 0);
	math.abs(r) > 1.2 && (r *= stepsize / 120);
	math.abs(i) > 1.2 && (i *= stepsize / 120);
	scrollarray(n, -r, -i);
	e.preventdefault()
}

function keydown(e) {
	var t = e.target,
		n = e.ctrlkey || e.altkey || e.metakey || e.shiftkey && e.keycode !== key.spacebar;
	if (/input|textarea|select|embed/i.test(t.nodename) || t.iscontenteditable || e.defaultprevented || n) return !0;
	if (isnodename(t, "button") && e.keycode === key.spacebar) return !0;
	var r, i = 0,
		s = 0,
		o = overflowingancestor(activeelement),
		u = o.clientheight;
	o == document.body && (u = window.innerheight);
	switch (e.keycode) {
		case key.up:
			s = -arrowscroll;
			break;
		case key.down:
			s = arrowscroll;
			break;
		case key.spacebar:
			r = e.shiftkey ? 1 : -1;
			s = -r * u * .9;
			break;
		case key.pageup:
			s = -u * .9;
			break;
		case key.pagedown:
			s = u * .9;
			break;
		case key.home:
			s = -o.scrolltop;
			break;
		case key.end:
			var a = o.scrollheight - o.scrolltop - u;
			s = a > 0 ? a + 10 : 0;
			break;
		case key.left:
			i = -arrowscroll;
			break;
		case key.right:
			i = arrowscroll;
			break;
		default:
			return !0
	}
	scrollarray(o, i, s);
	e.preventdefault()
}

function mousedown(e) {
	activeelement = e.target
}

function setcache(e, t) {
	for (var n = e.length; n--;) cache[uniqueid(e[n])] = t;
	return t
}

function overflowingancestor(e) {
	var t = [],
		n = root.scrollheight;
	do {
		var r = cache[uniqueid(e)];
		if (r) return setcache(t, r);
		t.push(e);
		if (n === e.scrollheight) {
			if (!frame || root.clientheight + 10 < n) return setcache(t, document.body)
		} else if (e.clientheight + 10 < e.scrollheight) {
			overflow = getcomputedstyle(e, "").getpropertyvalue("overflow-y");
			if (overflow === "scroll" || overflow === "auto") return setcache(t, e)
		}
	} while (e = e.parentnode)
}
 
function addevent(e, t, n) {
	window.addeventlistener(e, t, {passive:n || !1})
}

function removeevent(e, t, n) {
	window.removeeventlistener(e, t, {passive:n || !1})
}

function isnodename(e, t) {
	return (e.nodename || "").tolowercase() === t.tolowercase()
}

function directioncheck(e, t) {
	e = e > 0 ? 1 : -1;
	t = t > 0 ? 1 : -1;
	if (direction.x !== e || direction.y !== t) {
		direction.x = e;
		direction.y = t;
		que = [];
		lastscroll = 0
	}
}

function pulse_(e) {
	var t, n, r;
	e *= pulsescale;
	if (e < 1) t = e - (1 - math.exp(-e));
	else {
		n = math.exp(-1);
		e -= 1;
		r = 1 - math.exp(-e);
		t = n + r * (1 - n)
	}
	return t * pulsenormalize
}

function pulse(e) {
	if (e >= 1) return 1;
	if (e <= 0) return 0;
	pulsenormalize == 1 && (pulsenormalize /= pulse_(1));
	return pulse_(e)
}
var framerate = 150,
	animtime = 1e3,
	stepsize = 80,
	pulsealgorithm = !0,
	pulsescale = 8,
	pulsenormalize = 1,
	acceleration = !0,
	acceldelta = 10,
	accelmax = 1,
	keyboardsupport = !0,
	disablekeyboard = !1,
	arrowscroll = 50,
	exclude = "",
	disabled = !1,
	frame = !1,
	direction = {
		x: 0,
		y: 0
	},
	initdone = !1,
	fixedback = !0,
	root = document.documentelement,
	activeelement, key = {
		left: 37,
		up: 38,
		right: 39,
		down: 40,
		spacebar: 32,
		pageup: 33,
		pagedown: 34,
		end: 35,
		home: 36
	},
	que = [],
	pending = !1,
	lastscroll = +(new date),
	cache = {};
setinterval(function() {
	cache = {}
}, 1e4);
var uniqueid = function() {
		var e = 0;
		return function(t) {
			return t.uniqueid || (t.uniqueid = e++)
		}
	}(),
	requestframe = function() {
		return window.requestanimationframe || window.webkitrequestanimationframe || function(e, t, n) {
			window.settimeout(e, n || 1e3 / 60)
		}
	}();
addevent("mousedown", mousedown);
addevent("mousewheel", wheel);
addevent("load", init);