/**
 * SmoothScroll v0.9.9
 *
 * Licensed under the terms of the MIT license.
 * People involved:
 * - Balazs Galambosi: maintainer (CHANGELOG.txt)
 * - Patrick Brunner (patrickb1991@gmail.com)
 * - Michael Herf: ssc_pulse Algorithm
 */

function ssc_init() {

	if ( ! document.body) {
		return;
	}

	var e = document.body;

	var t = document.documentElement;

	var n = window.innerHeight;

	var r = e.scrollHeight;

	ssc_root = document.compatMode.indexOf( "CSS" ) >= 0 ? t : e;

	ssc_activeElement = e;

	ssc_initdone = true;

	if (top != self) {

		ssc_frame = true

	} else if (r > n && (e.offsetHeight <= n || t.offsetHeight <= n)) {

		ssc_root.style.height = "auto";

		if (ssc_root.offsetHeight <= n) {

			var i = document.createElement( "div" );

			i.style.clear = "both";

			e.appendChild( i )

		}

	}

	if ( ! ssc_fixedback) {

		e.style.backgroundAttachment = "scroll";

		t.style.backgroundAttachment = "scroll"

	}

	if (ssc_keyboardsupport) {

		ssc_addEvent( "keydown", ssc_keydown )

	}

}



function ssc_scrollArray(e, t, n, r) {

	r || (r = 1e3);

	ssc_directionCheck( t, n );

	ssc_que.push(
		{

			x: t,

			y: n,

			lastX: t < 0 ? .99 : -.99,

			lastY: n < 0 ? .99 : -.99,

			start: +(new Date)

		}
	);

	if (ssc_pending) {

		return

	}

	var i = function () {

		var s = +(new Date);

		var o = 0;

		var u = 0;

		for (var a = 0; a < ssc_que.length; a++) {

			var f = ssc_que[a];

			var l = s - f.start;

			var c = l >= ssc_animtime;

			var h = c ? 1 : l / ssc_animtime;

			if (ssc_pulseAlgorithm) {

				h = ssc_pulse( h )

			}

			var p = f.x * h - f.lastX >> 0;

			var d = f.y * h - f.lastY >> 0;

			o += p;

			u += d;

			f.lastX += p;

			f.lastY += d;

			if (c) {

				ssc_que.splice( a, 1 );

				a--

			}

		}

		if (t) {

			var v = e.scrollLeft;

			e.scrollLeft += o;

			if (o && e.scrollLeft === v) {

				t = 0

			}

		}

		if (n) {

			var m = e.scrollTop;

			e.scrollTop += u;

			if (u && e.scrollTop === m) {

				n = 0

			}

		}

		if ( ! t && ! n) {

			ssc_que = []

		}

		if (ssc_que.length) {

			setTimeout( i, r / ssc_framerate + 1 )

		} else {

			ssc_pending = false

		}

	};

	setTimeout( i, 0 );

	ssc_pending = true

}



function ssc_wheel(e) {

	if ( ! ssc_initdone) {

		ssc_init()

	}

	var t = e.target;

	var n = ssc_overflowingAncestor( t );

	if ( ! n || e.defaultPrevented || ssc_isNodeName( ssc_activeElement, "embed" ) || ssc_isNodeName( t, "embed" ) && /\.pdf/i.test( t.src )) {

		return true

	}

	var r = e.wheelDeltaX || 0;

	var i = e.wheelDeltaY || 0;

	if ( ! r && ! i) {

		i = e.wheelDelta || 0

	}

	if (Math.abs( r ) > 1.2) {

		r *= ssc_stepsize / 120

	}

	if (Math.abs( i ) > 1.2) {

		i *= ssc_stepsize / 120

	}

	ssc_scrollArray( n, -r, -i );

	e.preventDefault()

}



function ssc_keydown(e) {

	var t = e.target;

	var n = e.ctrlKey || e.altKey || e.metaKey;

	if (/input|textarea|embed/i.test( t.nodeName ) || t.isContentEditable || e.defaultPrevented || n) {

		return true

	}

	if (ssc_isNodeName( t, "button" ) && e.keyCode === ssc_key.spacebar) {

		return true

	}

	var r, i = 0,

		s = 0;

	var o = ssc_overflowingAncestor( ssc_activeElement );

	var u = o.clientHeight;

	if (o == document.body) {

		u = window.innerHeight

	}

	switch (e.keyCode) {

		case ssc_key.up:

			s = -ssc_arrowscroll;

		break;

		case ssc_key.down:

			s = ssc_arrowscroll;

		break;

		case ssc_key.spacebar:

			r = e.shiftKey ? 1 : -1;

			s = -r * u * .9;

		break;

		case ssc_key.pageup:

			s = -u * .9;

		break;

		case ssc_key.pagedown:

			s = u * .9;

		break;

		case ssc_key.home:

			s = -o.scrollTop;

		break;

		case ssc_key.end:

			var a = o.scrollHeight - o.scrollTop - u;

			s = a > 0 ? a + 10 : 0;

		break;

		case ssc_key.left:

			i = -ssc_arrowscroll;

		break;

		case ssc_key.right:

			i = ssc_arrowscroll;

		break;

		default:

		return true

	}

	ssc_scrollArray( o, i, s );

	e.preventDefault()

}



function ssc_mousedown(e) {

	ssc_activeElement = e.target

}



function ssc_setCache(e, t) {

	for (var n = e.length; n--;) {
		ssc_cache[ssc_uniqueID( e[n] )] = t;
	}

	return t

}



function ssc_overflowingAncestor(e) {

	var t = [];

	var n = ssc_root.scrollHeight;

	do {

		var r = ssc_cache[ssc_uniqueID( e )];

		if (r) {

			return ssc_setCache( t, r )

		}

		t.push( e );

		if (n === e.scrollHeight) {

			if ( ! ssc_frame || ssc_root.clientHeight + 10 < n) {

				return ssc_setCache( t, document.body )

			}

		} else if (e.clientHeight + 10 < e.scrollHeight) {

			overflow = getComputedStyle( e, "" ).getPropertyValue( "overflow" );

			if (overflow === "scroll" || overflow === "auto") {

				return ssc_setCache( t, e )

			}

		}

	} while (e = e.parentNode)}



function ssc_addEvent(e, t, n) {

	window.addEventListener( e, t, n || false )

}



function ssc_removeEvent(e, t, n) {

	window.removeEventListener( e, t, n || false )

}



function ssc_isNodeName(e, t) {

	return e.nodeName.toLowerCase() === t.toLowerCase()

}



function ssc_directionCheck(e, t) {

	e = e > 0 ? 1 : -1;

	t = t > 0 ? 1 : -1;

	if (ssc_direction.x !== e || ssc_direction.y !== t) {

		ssc_direction.x = e;

		ssc_direction.y = t;

		ssc_que = []

	}

}



function ssc_pulse_(e) {

	var t, n, r;

	e = e * ssc_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 * ssc_pulseNormalize

}



function ssc_pulse(e) {

	if (e >= 1) {
		return 1;
	}

	if (e <= 0) {
		return 0;
	}

	if (ssc_pulseNormalize == 1) {

		ssc_pulseNormalize /= ssc_pulse_( 1 )

	}

	return ssc_pulse_( e )

}



var ssc_framerate = 150;

var ssc_animtime = 500;

var ssc_stepsize = 150;

var ssc_pulseAlgorithm = true;

var ssc_pulseScale = 6;

var ssc_pulseNormalize = 1;

var ssc_keyboardsupport = true;

var ssc_arrowscroll = 50;

var ssc_frame = false;

var ssc_direction = {

	x: 0,

	y: 0

};



var ssc_initdone = false;

var ssc_fixedback = true;

var ssc_root = document.documentElement;

var ssc_activeElement;

var ssc_key = {

	left: 37,

	up: 38,

	right: 39,

	down: 40,

	spacebar: 32,

	pageup: 33,

	pagedown: 34,

	end: 35,

	home: 36

};



var ssc_que = [];

var ssc_pending = false;

var ssc_cache = {};



setInterval(
	function () {

		ssc_cache = {}

	}, 10 * 1e3
);



var ssc_uniqueID = function () {

	var e = 0;

	return function (t) {

		return t.ssc_uniqueID || (t.ssc_uniqueID = e++)

	}

}();



var ischrome = /chrome/.test( navigator.userAgent.toLowerCase() );



if (ischrome) {

	ssc_addEvent( "mousedown", ssc_mousedown );

	ssc_addEvent( "mousewheel", ssc_wheel );

	ssc_addEvent( "load", ssc_init )

}