// scrollsaver.js
// Copyright (C) 2009 M. Mahdi Hasheminezhad (hasheminezhad at gmail dot com)
// Maintain scroll position of every element on postbacks and partial updates
// This source is licensed under Common Public License Version 1.0 (CPL) 
// History:
// 2009-08-21 First Public Release M. Mahdi Hasheminezhad (http://hasheminezhad.com)
//http://en.hasheminezhad.com/scrollsaver
(function()
{
	function ls()
	{
		var c=document.cookie.split(';');
		for(var i=0;i<c.length;i++)
		{
			var p=c[i].split('=');
			if(p[0]=='scrollPosition')
			{
				p=unescape(p[1]).split('/');
				for(var j=0;j<p.length;j++)
				{
					var e=p[j].split(',');
					try
					{
						if(e[0]=='window')
						{
							window.scrollTo(e[1],e[2]);
						}
						else if(e[0])
						{
							var o=document.getElementById(e[0]);
							o.scrollLeft=e[1];o.scrollTop=e[2];
						}
					}
					catch(ex){}
				}
				return;
			}
		}
	}
	function ss()
	{
		var s='scrollPosition=';
		var l,t;
		if(window.pageXOffset!==undefined)
		{
			l=window.pageXOffset;
			t=window.pageYOffset;
		}
		else if(document.documentElement&&document.documentElement.scrollLeft!==undefined)
		{
			l=document.documentElement.scrollLeft;
			t=document.documentElement.scrollTop;
		}
		else
		{
			l=document.body.scrollLeft;
			t=document.body.scrollTop;
		}
		if(l||t)
		{s+='window,'+l+','+t+'/'; }
		var es=(document.all)?document.all:document.getElementsByTagName('*');
		for(var i=0;i<es.length;i++)
		{
			var e=es[i];
			if(e.id&&(e.scrollLeft||e.scrollTop))
			{
				s+=e.id+','+e.scrollLeft+','+e.scrollTop+'/';
			}
		}
		document.cookie=s+';';
	}
	var a,p;
	if(window.attachEvent)
	{ 
		a=window.attachEvent;
		p='on'; 
	}
	else
	{ 
		a=window.addEventListener;
		p=''; 
	}
	a(p+'load',
		function()
		{
		 ls();
		 if(typeof Sys!='undefined'&&typeof Sys.WebForms!='undefined')
		 {
				Sys.WebForms.PageRequestManager.getInstance().add_endRequest(ls);
				Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(ss);
		 }
		}
	,false);
	a(p+'unload',ss,false);
})();