function intval(v)
{
	 v = parseInt(v);
	 return isNaN(v) ? 0 : v;
}


function getPos(e)
{
	 var l = 0;
	 var t = 0;
	 var w = intval(e.style.width);
	 var h = intval(e.style.height);
	 var wb = e.offsetWidth;
	 var hb = e.offsetHeight;
	 while (e.offsetParent){
		 l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
		 t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
		 e = e.offsetParent;
	 }
	 l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
	 t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
	 return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
}


function getScroll()
{
 var t, l, w, h;

 if (document.documentElement && document.documentElement.scrollTop) {
	 t = document.documentElement.scrollTop;
	 l = document.documentElement.scrollLeft;
	 w = document.documentElement.scrollWidth;
	 h = document.documentElement.scrollHeight;
 } else if (document.body) {
	 t = document.body.scrollTop;
	 l = document.body.scrollLeft;
	 w = document.body.scrollWidth;
	 h = document.body.scrollHeight;
 }
 return { t: t, l: l, w: w, h: h };
}


function scroller(el, duration)
{
 if(typeof el != 'object') { el = document.getElementById(el); }

 if(!el) return;

 var z = this;
 z.el = el;
 z.p = getPos(el);
 z.s = getScroll();
 z.clear = function(){window.clearInterval(z.timer);z.timer=null};
 z.t=(new Date).getTime();

 z.step = function(){
 var t = (new Date).getTime();
 var p = (t - z.t) / duration;
 if (t >= duration + z.t) {
 z.clear();
 window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
 } else {
 st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
 sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
 z.scroll(st, sl);
 }
 };
 z.scroll = function (t, l){window.scrollTo(l, t)};
 z.timer = window.setInterval(function(){z.step();},13);
}