function createCookie(name, value, days)
{
	var today = new Date();
 		var expire = new Date();
 		if (days==null || days==0) days=990;
 		expire.setTime(today.getTime() + 3600000*24*days);
 		document.cookie = name+"="+escape(value)
                 + ";expires="+expire.toGMTString();
}

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