/// <summary>
/// Create cookie or overwrite existing cookie.
/// </summary>
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=/";
}
/// <summary>
/// Read value from cookie.
/// </summary>
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;
}
/// <summary>
/// Removes a cookie.
/// </summary>
function eraseCookie(name) 
{
	createCookie(name, "", -1);
}
/// <summary>
/// Persit url as new origin. Goto url. If url is null, remove persisted origin.
/// </summary>
function setOrigin(url)
{
	if (url)
	{
		createCookie("origin", url, 360);
		location.href = url;
	}
	else
	{
		eraseCookie("origin");
	}
}
/// <summary>
/// If persited origin is available, goto origin.
/// </summary>
function gotoOrigin()
{
	var url = readCookie("origin");
	if(url)
	{
		location.href = url;
		return true;
	}
	else
	{
		return false;
	}
}