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

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

function eraseCookie(name)
{
	createCookie(name, "", -1);
}