Object.extend = function(destination, source) {
	for (property in source) destination[property] = source[property];
	return destination;
}

Function.prototype.bind = function(object) {
	var __method = this;
	return function() {
		return __method.apply(object, arguments);
	}
}

Function.prototype.bindAsEventListener = function(object) {
var __method = this;
	return function(event) {
		__method.call(object, event || window.event);
	}
}

var Class = {
	create: function() {
		return function() {
			this.initialize.apply(this, arguments);
		}
	}
}

function $() {
	if (arguments.length == 1) return get$(arguments[0]);
	var elements = [];
	$c(arguments).each(function(el){
		elements.push(get$(el));
	});
	return elements;

	function get$(el){
		if (typeof el == 'string') el = document.getElementById(el);
		return el;
	}
}

function $c(array){
	var nArray = [];
	for (var i=0;i<array.length;i++) nArray.push(array[i]);
	return nArray;
}

var Position = {
	cumulativeOffset: function(element) {
		var valueT = 0, valueL = 0;
		do {
			valueT += element.offsetTop  || 0;
			valueL += element.offsetLeft || 0;
			element = element.offsetParent;
		} while (element);
		return [valueL, valueT];
	}
};

var fx = new Object();
//base
fx.Base = function(){};
fx.Base.prototype = {
	setOptions: function(options) {
	this.options = {
		duration: 500,
		onComplete: '',
		transition: fx.sinoidal
	}
	Object.extend(this.options, options || {});
	},

	step: function() {
		var time  = (new Date).getTime();
		if (time >= this.options.duration+this.startTime) {
			this.now = this.to;
			clearInterval (this.timer);
			this.timer = null;
			if (this.options.onComplete) setTimeout(this.options.onComplete.bind(this), 10);
		}
		else {
			var Tpos = (time - this.startTime) / (this.options.duration);
			this.now = this.options.transition(Tpos) * (this.to-this.from) + this.from;
		}
		this.increase();
	},

	custom: function(from, to) {
		if (this.timer != null) return;
		this.from = from;
		this.to = to;
		this.startTime = (new Date).getTime();
		this.timer = setInterval (this.step.bind(this), 13);
	},

	hide: function() {
		this.now = 0;
		this.increase();
	},

	clearTimer: function() {
		clearInterval(this.timer);
		this.timer = null;
	}
}


fx.Scroll = Class.create();
fx.Scroll.prototype = Object.extend(new fx.Base(), {
	initialize: function(options) {
		this.setOptions(options);
	},

	scrollTo: function(el){
		var dest = Position.cumulativeOffset($(el))[1];
		var client = window.innerHeight || document.documentElement.clientHeight;
		var full = document.documentElement.scrollHeight;
		var top = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
		if (dest+client > full) this.custom(top, dest - client + (full-dest));
		else this.custom(top, dest);
	},

	increase: function(){
		window.scrollTo(0, this.now);
	}
});

fx.sineOut = function(pos){
	return Math.sin(pos * (Math.PI/2));
}

var ScrollLinks = {
    currentHash: false,
	start: function(){
		this.scroll = new fx.Scroll({duration: 1500, transition: fx.sineOut, onComplete: function(){this.end();}.bind(this)});
		this.allinks = $c(document.getElementsByTagName('a'));
		
		for(var i=0; i<this.allinks.length; i++) {
		
			var lnk = this.allinks[i]; 
			
			if ((lnk.href && lnk.href.indexOf('#') != -1) && ( (lnk.pathname == location.pathname) 
				|| ('/'+lnk.pathname == location.pathname) ) && (lnk.search == location.search)) {
				lnk.num = i;
				lnk.onclick = function(){

					ScrollLinks.scroll.clearTimer();
					this.initialHref = this.href;
					this.initialHash = this.hash;
					this.href = "javascript:void(0)";
					setTimeout(function(){this.href = this.initialHref;}.bind(this), 200);
					ScrollLinks.go(this);
				}
			}
		};
	},

	go: function(link){
	  this.currentHash = link.initialHash.slice(1); 
	  this.currentBlock = $(this.currentHash);
	  if (this.currentBlock) { 
	    ScrollLinks.scroll.scrollTo(this.currentBlock);
	  }
	},

	end: function(){
		if (!/Konqueror|Safari|KHTML/.test(navigator.userAgent)) window.location.hash = "#"+this.currentHash;
		this.currentHash = false;
	}
}