function getScrollingPosition()
{
  var position = [0, 0];
  if (typeof window.pageYOffset != 'undefined')
  {
    position = [
        window.pageXOffset,
        window.pageYOffset
    ];
  }
  else if (typeof document.documentElement.scrollTop
      != 'undefined' && document.documentElement.scrollTop > 0)
  {
    position = [
        document.documentElement.scrollLeft,
        document.documentElement.scrollTop
    ];
  }
  else if (typeof document.body.scrollTop != 'undefined')
  {
    position = [
        document.body.scrollLeft,
        document.body.scrollTop
    ];
  }
  return position;
}

function _registerEventHandler(target, eventType, functionRef, capture)
{
    if (typeof target.addEventListener != "undefined")
    {
        target.addEventListener(eventType, functionRef, capture);
    }
	else if (typeof target.attachEvent != "undefined")
	{
		target.attachEvent("on" + eventType, functionRef);
	}
	else
	{
		eventType = "on" + eventType;
		if (typeof target[eventType] == "function")
		{
			var oldListener = target[eventType];
			target[eventType] = function()
			{
				oldListener();
				return functionRef();
			};
		}
		else
		{
			target[eventType] = functionRef;
		}
	}
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function saveScrollPosition()
{
	position = getScrollingPosition();
	value = window.location + ',' + position[0] + ',' + position[1];
	
	createCookie('ci_scroll', value, 7);
}

function restoreScrollPosition()
{
	position = readCookie('ci_scroll');
	if(position)
	{
		position = position.split(',');
		if( window.location.toString() == position[0].toString() )
		{
			window.scrollTo(position[1], position[2]);
		}
	}
}

_registerEventHandler(window, 'unload', saveScrollPosition, false); 
_registerEventHandler(window, 'load', restoreScrollPosition, false);