/*--------------------------------------------------------------------------
 *  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:5,
	margin:15,

	// 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
		if (window.scrollY) return window.scrollY
	    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.scrollStop();
		}
		Scroller.offsetTop=a
	},
	
	//+ scroll stop target
	scrollStop: function(){
		location.hash = pthash;
		pthash = null;
	},

	// initializer that adds the renderer to the onload function of the window
	init: function(){
		Scroller.add(window,'load', Scroller.outsidechk)
		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){
						pthash = l;
						if(l == "top" || window.attachEvent && !window.opera){ //anchor name "#top"
						marginpx = 0;		
						} else {
						marginpx = Scroller.margin;
						}
				     		clearInterval(Scroller.interval);						
				     		// Scroller.interval=setInterval('Scroller.scroll('+Scroller.gy(a[i])+')',10);
				     		Scroller.interval=setInterval('Scroller.scroll('+Scroller.gy(a[i])+'-marginpx)',10);
						}		
					}
				}
	      	}
		}
	},

	//+ outside chk
	outsidechk: function(){
		Scroller.end(this);
		preurl = location.href.split('#');
   		preanchor = preurl[1];

		if (preanchor) {
			if (window.attachEvent && !window.opera) {
			setTimeout( function(){window.scrollTo(0,0);Scroller.osrender();},80 );
			} else {
			window.scrollTo(0,0);
			Scroller.osrender();
			//} else {
			}
		}
	},

	//+ outside scroll
	osrender: 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,'load',Scroller.end)
	      			Scroller.end(this);
		        	l = location.hash.substr(1);
		        	 a = document.getElementsByTagName('a');
				     for (i=0;i<a.length;i++) {
				     	if(a[i].name == l){
						pthash = l;
						if(l == "top" || window.attachEvent && !window.opera){
						marginpx = 0;		
						} else {
						marginpx = Scroller.margin;
						}		 
				     		clearInterval(Scroller.interval);
						Scroller.interval=setInterval('Scroller.scroll('+Scroller.gy(a[i])+'-marginpx)',10);
						}		
					}
	      	}
		}
	}
}

// invoke the initializer of the scroller
Scroller.init();