// ripped off from here: http://www.quirksmode.org/js/cookies.html
function create_cookie(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=/'
}

create_cookie('timezone_offset', new Date().getTimezoneOffset() / 60, 7)