/*--------------------------------------------------------------------------
 *  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 (){
		
		if (window.opera) { // Opera
			switch (document.compatMode) {
				case undefined : // Opera6
				case 'QuirksMode': // Opera7互換
				case 'BackCompat': // Opera7互換
					b = document.body;
					break;
				default: // Opera7標準
					b = document.documentElement;
					break;
			}
		} else if (document.all) { // IE
			ie = true;
			switch (document.compatMode) {
				case undefined : // IE4,IE5
				case 'BackCompat': // IE6互換
					b = document.body;
					break;
				default: // IE6標準
					b = document.documentElement;
					break;
			}
		} else { // NN
			switch (document.compatMode) {
				case undefined : // NN6??
				case 'BackCompat': // NN7互換
					b = document.body;
					break;
				default: // NN7標準
					b = document.documentElement;
					break;
			}
		}

	    if (b && b.scrollTop) return b.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);
						}
					}
				}
	      	}
		}
	}
}
// invoke the initializer of the scroller
Scroller.init();


/*------------------------------------------------------------
 *						END OF CODE
/*-----------------------------------------------------------*/