var Kotvy = {
	interval: 25,
	multiplier: 7,
	init: function()
	{
		var a = document.getElementsByTagName("a");
		var url = location.href.substring(0, location.href.length - location.hash.length);
		for(var i = 0, l = a.length; i < l; i++)
		{
			if(a[i].href.substr(0, url.length) == url && a[i].href.indexOf("#") > -1)
			{
				a[i].destination = document.getElementById(a[i].hash.substr(1));
				a[i].onclick = Kotvy.click;
			}
		}
	},
	click: function()
	{
		if(!this.destination) return true;
		var d = this.destination;
		Kotvy.intervalId = setInterval(function()
		{
			Kotvy.moveTo(d);
		}, Kotvy.interval)
		Kotvy.moveTo(d);
		return false;
	},
	moveTo: function(destination)
	{
		var x = 0, y = -1;
		var o = destination;
		while(o)
		{
			x += o.offsetLeft;
			y += o.offsetTop;
			o = o.offsetParent;
		}
		var spo = Kotvy.scrollPosition();
		var dx = (x - spo[0]) / Kotvy.multiplier, dy = (y - spo[1]) / Kotvy.multiplier;
		if(dx > 0) dx = Math.ceil(dx); else dx = Math.floor(dx);
		if(dy > 0) dy = Math.ceil(dy); else dy = Math.floor(dy);
		scrollBy(dx, dy);
		var spn = Kotvy.scrollPosition();
		if(spo[0] == spn[0] && spo[1] == spn[1])
		{
			clearInterval(Kotvy.intervalId);
			location.hash = destination.id;
		}
	},
	scrollPosition: function()
	{
		return [document.body.scrollLeft || document.documentElement.scrollLeft || window.pageXOffset || 0, document.body.scrollTop || document.documentElement.scrollTop || window.pageYOffset || 0];
	}
};