//**** need 'DOCTYPE' ****
//
var SmoothScroll = {
speed : 20, //set here the scroll speed: when this value increase, the speed decrease.
maxStep: 200, //set here the "uniform motion" step for long distances
brakeK: 3, //set here the coefficient of slowing down
hash:null,
currentBlock:null,
requestedY:0,
init: function() {
var lnks = document.getElementsByTagName('a');
for(var i = 0, lnk; lnk = lnks[i]; i++) {
if ((lnk.href && lnk.href.indexOf('#') != -1) && ( (lnk.pathname == location.pathname) || ('/'+lnk.pathname == location.pathname) ) && (lnk.search == location.search)) {
lnk.onclick = SmoothScroll.initScroll;
}
}
},
getElementYpos: function(el){
var y = 0;
while(el.offsetParent){
y += el.offsetTop
el = el.offsetParent;
} return y;
},
getScrollTop: function(){
if(document.all) return (document.documentElement.scrollTop) ? document.documentElement.scrollTop : document.body.scrollTop;
else return window.pageYOffset;
},
getWindowHeight: function(){
if (window.innerHeight) return window.innerHeight;
if(document.documentElement && document.documentElement.clientHeight) return document.documentElement.clientHeight;
},
getDocumentHeight: function(){
if (document.height) return document.height;
if(document.body.offsetHeight) return document.body.offsetHeight;
},
initScroll: function(e){
var targ;
if (!e) var e = window.event;
if (e.target) targ = e.target;
else if (e.srcElement) targ = e.srcElement;
SmoothScroll.hash = targ.href.substr(targ.href.indexOf('#')+1,targ.href.length);
SmoothScroll.currentBlock = document.getElementById(SmoothScroll.hash);
if(!SmoothScroll.currentBlock) return;
SmoothScroll.requestedY = SmoothScroll.getElementYpos(SmoothScroll.currentBlock);
SmoothScroll.scroll();
return false;
},
scroll: function(){
var top = SmoothScroll.getScrollTop();
if(SmoothScroll.requestedY > top) {
var endDistance = Math.round((SmoothScroll.getDocumentHeight() - (top + SmoothScroll.getWindowHeight())) / SmoothScroll.brakeK);
endDistance = Math.min(Math.round((SmoothScroll.requestedY-top)/ SmoothScroll.brakeK), endDistance);
var offset = Math.max(2, Math.min(endDistance, SmoothScroll.maxStep));
} else { var offset = - Math.min(Math.abs(Math.round((SmoothScroll.requestedY-top)/ SmoothScroll.brakeK)), SmoothScroll.maxStep);
} window.scrollTo(0, top + offset);
if(Math.abs(top-SmoothScroll.requestedY) <= 1 || SmoothScroll.getScrollTop() == top) {
window.scrollTo(0, SmoothScroll.requestedY);
if(!document.all || window.opera) location.hash = SmoothScroll.hash;
SmoothScroll.hash = null;
} else setTimeout(SmoothScroll.scroll,SmoothScroll.speed);
}
}