Scroller = {
// control the speed of the scroller.
// dont change it here directly, please use Scroller.speed=50;
speed:7,

// returns the Y position of the div
gy: function (d) {
gy = d.offsetTop
if (d.offsetParent) while (d = d.offsetParent) gy += d.offsetTop
return gy
},

// returns the current scroll position
scrollTop: function (){
body=document.body
    d=document.documentElement
    if (body && body.scrollTop) return body.scrollTop
    if (d && d.scrollTop) return d.scrollTop
    if (window.pageYOffset) return window.pageYOffset
    return 0
},

// attach an event for an element
// (element, type, function)
add: function(event, body, d) {
    if (event.addEventListener) return event.addEventListener(body, d,false)
    if (event.attachEvent) return event.attachEvent('on'+body, d)
},

// kill an event of an element
end: function(e){
if (window.event) {
window.event.cancelBubble = true
window.event.returnValue = false
      return;
    }
    if (e.preventDefault && e.stopPropagation) {
      e.preventDefault()
      e.stopPropagation()
    }
},

// move the scroll bar to the particular div.
scroll: function(d){
h=document.body.scrollHeight;
a = Scroller.scrollTop()
if(d>a)
a+=Math.ceil((d-a)/Scroller.speed)
else
a = a+(d-a)/Scroller.speed;
window.scrollTo(0,a)
  if(a==d || Scroller.offsetTop==a)clearInterval(Scroller.interval)
  Scroller.offsetTop=a
},
// initializer that adds the renderer to the onload function of the window
init: function(){
Scroller.add(window,'load', Scroller.render)
},

// this method extracts all the anchors and validates then as # and attaches the events.
render: function(){
a = document.getElementsByTagName('a');
Scroller.end(this);
window.onscroll
    for (i=0;i<a.length;i++) {
      l = a[i];
      if(l.href && l.href.indexOf('#') != -1 && ((l.pathname==location.pathname) || ('/'+l.pathname==location.pathname)) ){
      Scroller.add(l,'click',Scroller.end)
      l.onclick = function(){
      Scroller.end(this);
        l=this.hash.substr(1);
         a = document.getElementsByTagName('a');
     for (i=0;i<a.length;i++) {
     if(a[i].name == l){
     clearInterval(Scroller.interval);
     Scroller.interval=setInterval('Scroller.scroll('+Scroller.gy(a[i])+')',10);
}
}
}
      }
}
}
}
Scroller.init();