(function(){var defaultOptions={frameRate:150,animationTime:400,stepSize:120,pulseAlgorithm:true,pulseScale:8,pulseNormalize:1,accelerationDelta:20,accelerationMax:1,keyboardSupport:true,arrowScroll:50,touchpadSupport:true,fixedBackground:true,excluded:""};var options=defaultOptions;var isExcluded=false;var isFrame=false;var direction={x:0,y:0};var initDone=false;var root=document.documentElement;var activeElement;var observer;var deltaBuffer=[120,120,120];var key={left:37,up:38,right:39,down:40,spacebar:32,pageup:33,pagedown:34,end:35,home:36};var options=defaultOptions;function initTest(){var disableKeyboard=false;if(disableKeyboard){removeEvent("keydown",keydown);}
if(options.keyboardSupport&&!disableKeyboard){addEvent("keydown",keydown);}}
function init(){if(!document.body)return;var body=document.body;var html=document.documentElement;var windowHeight=window.innerHeight;var scrollHeight=body.scrollHeight;root=(document.compatMode.indexOf('CSS')>=0)?html:body;activeElement=body;initTest();initDone=true;if(top!=self){isFrame=true;}
else if(scrollHeight>windowHeight&&(body.offsetHeight<=windowHeight||html.offsetHeight<=windowHeight)){var pending=false;var refresh=function(){if(!pending&&html.scrollHeight!=document.height){pending=true;setTimeout(function(){html.style.height=document.height+'px';pending=false;},500);}};html.style.height='auto';setTimeout(refresh,10);if(root.offsetHeight<=windowHeight){var underlay=document.createElement("div");underlay.style.clear="both";body.appendChild(underlay);}}
if(!options.fixedBackground&&!isExcluded){body.style.backgroundAttachment="scroll";html.style.backgroundAttachment="scroll";}}
var que=[];var pending=false;var lastScroll=+new Date;function scrollArray(elem,left,top,delay){delay||(delay=1000);directionCheck(left,top);if(options.accelerationMax!=1){var now=+new Date;var elapsed=now-lastScroll;if(elapsed<options.accelerationDelta){var factor=(1+(30/elapsed))/2;if(factor>1){factor=Math.min(factor,options.accelerationMax);left*=factor;top*=factor;}}
lastScroll=+new Date;}
que.push({x:left,y:top,lastX:(left<0)?0.99:-0.99,lastY:(top<0)?0.99:-0.99,start:+new Date});if(pending){return;}
var scrollWindow=(elem===document.body);var step=function(time){var now=+new Date;var scrollX=0;var scrollY=0;for(var i=0;i<que.length;i++){var item=que[i];var elapsed=now-item.start;var finished=(elapsed>=options.animationTime);var position=(finished)?1:elapsed/options.animationTime;if(options.pulseAlgorithm){position=pulse(position);}
var x=(item.x*position-item.lastX)>>0;var y=(item.y*position-item.lastY)>>0;scrollX+=x;scrollY+=y;item.lastX+=x;item.lastY+=y;if(finished){que.splice(i,1);i--;}}
if(scrollWindow){window.scrollBy(scrollX,scrollY);}
else{if(scrollX)elem.scrollLeft+=scrollX;if(scrollY)elem.scrollTop+=scrollY;}
if(!left&&!top){que=[];}
if(que.length){requestFrame(step,elem,(delay/options.frameRate+1));}else{pending=false;}};requestFrame(step,elem,0);pending=true;}
function wheel(event){if(!initDone){init();}
var target=event.target;var overflowing=overflowingAncestor(target);if(!overflowing||event.defaultPrevented||isNodeName(activeElement,"embed")||(isNodeName(target,"embed")&&/\.pdf/i.test(target.src))){return true;}
var deltaX=event.wheelDeltaX||0;var deltaY=event.wheelDeltaY||0;if(!deltaX&&!deltaY){deltaY=event.wheelDelta||0;}
if(!options.touchpadSupport&&isTouchpad(deltaY)){return true;}
if(Math.abs(deltaX)>1.2){deltaX*=options.stepSize/120;}
if(Math.abs(deltaY)>1.2){deltaY*=options.stepSize/120;}
scrollArray(overflowing,-deltaX,-deltaY);event.preventDefault();}
function keydown(event){var target=event.target;var modifier=event.ctrlKey||event.altKey||event.metaKey||(event.shiftKey&&event.keyCode!==key.spacebar);if(/input|textarea|select|embed/i.test(target.nodeName)||target.isContentEditable||event.defaultPrevented||modifier){return true;}
if(isNodeName(target,"button")&&event.keyCode===key.spacebar){return true;}
var shift,x=0,y=0;var elem=overflowingAncestor(activeElement);var clientHeight=elem.clientHeight;if(elem==document.body){clientHeight=window.innerHeight;}
switch(event.keyCode){case key.up:y=-options.arrowScroll;break;case key.down:y=options.arrowScroll;break;case key.spacebar:shift=event.shiftKey?1:-1;y=-shift*clientHeight*0.9;break;case key.pageup:y=-clientHeight*0.9;break;case key.pagedown:y=clientHeight*0.9;break;case key.home:y=-elem.scrollTop;break;case key.end:var damt=elem.scrollHeight-elem.scrollTop-clientHeight;y=(damt>0)?damt+10:0;break;case key.left:x=-options.arrowScroll;break;case key.right:x=options.arrowScroll;break;default:return true;}
scrollArray(elem,x,y);event.preventDefault();}
function mousedown(event){activeElement=event.target;}
var cache={};setInterval(function(){cache={};},10*1000);var uniqueID=(function(){var i=0;return function(el){return el.uniqueID||(el.uniqueID=i++);};})();function setCache(elems,overflowing){for(var i=elems.length;i--;)
cache[uniqueID(elems[i])]=overflowing;return overflowing;}
function overflowingAncestor(el){var elems=[];var rootScrollHeight=root.scrollHeight;do{var cached=cache[uniqueID(el)];if(cached){return setCache(elems,cached);}
elems.push(el);if(rootScrollHeight===el.scrollHeight){if(!isFrame||root.clientHeight+10<rootScrollHeight){return setCache(elems,document.body);}}else if(el.clientHeight+10<el.scrollHeight){overflow=getComputedStyle(el,"").getPropertyValue("overflow-y");if(overflow==="scroll"||overflow==="auto"){return setCache(elems,el);}}}while(el=el.parentNode);}
function addEvent(type,fn,bubble){window.addEventListener(type,fn,(bubble||false));}
function removeEvent(type,fn,bubble){window.removeEventListener(type,fn,(bubble||false));}
function isNodeName(el,tag){return(el.nodeName||"").toLowerCase()===tag.toLowerCase();}
function directionCheck(x,y){x=(x>0)?1:-1;y=(y>0)?1:-1;if(direction.x!==x||direction.y!==y){direction.x=x;direction.y=y;que=[];lastScroll=0;}}
var deltaBufferTimer;function isTouchpad(deltaY){if(!deltaY)return;deltaY=Math.abs(deltaY)
deltaBuffer.push(deltaY);deltaBuffer.shift();clearTimeout(deltaBufferTimer);var allDivisable=(isDivisible(deltaBuffer[0],120)&&isDivisible(deltaBuffer[1],120)&&isDivisible(deltaBuffer[2],120));return!allDivisable;}
function isDivisible(n,divisor){return(Math.floor(n/divisor)==n/divisor);}
var requestFrame=(function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||function(callback,element,delay){window.setTimeout(callback,delay||(1000/60));};})();function pulse_(x){var val,start,expx;x=x*options.pulseScale;if(x<1){val=x-(1-Math.exp(-x));}else{start=Math.exp(-1);x-=1;expx=1-Math.exp(-x);val=start+(expx*(1-start));}
return val*options.pulseNormalize;}
function pulse(x){if(x>=1)return 1;if(x<=0)return 0;if(options.pulseNormalize==1){options.pulseNormalize/=pulse_(1);}
return pulse_(x);}
var isChrome=/chrome/i.test(window.navigator.userAgent);var wheelEvent=null;if("onwheel"in document.createElement("div"))
wheelEvent="wheel";else if("onmousewheel"in document.createElement("div"))
wheelEvent="mousewheel";if(wheelEvent&&isChrome){addEvent(wheelEvent,wheel);addEvent("mousedown",mousedown);addEvent("load",init);}})();