/*--------------------------------------------------------------------------
 *  Smooth Scroller Script, version 1.0.1
 *  (c) 2007 Dezinerfolio Inc. <midart@gmail.com>
 *
 *  For details, please check the website : http://dezinerfolio.com/
 *
 /*--------------------------------------------------------------------------*/
Scroller = {
    // control the speed of the scroller.
    // dont change it here directly, please use Scroller.speed=50;
    speed: 10,
    
    // 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){
        i = window.innerHeight || document.documentElement.clientHeight;
        h = document.body.scrollHeight;
        a = Scroller.scrollTop()
        if (d > a) 
            if (h - d > i) 
                a += Math.ceil((d - a) / Scroller.speed)
            else 
                a += Math.ceil((d - a - (h - d)) / 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);
                        }
                    }
                }
            }
        }
    }
}