function set_cookie(name, value, exp_y, exp_m, exp_d, path, domain, secure) {
	var cookie_string = name + "=" + escape (value);

	if (exp_y) {
		var expires = new Date (exp_y, exp_m, exp_d);
		cookie_string += "; expires=" + expires.toGMTString();
	}

	if (path) {
		cookie_string += "; path=" + escape (path);	
	}

	if (domain) {
		cookie_string += "; domain=" + escape(domain);
	}

	if (secure) {
		cookie_string += "; secure";
	}

	document.cookie = cookie_string;
}

function delete_cookie(cookie_name) {
	var cookie_date = new Date();  // current date & time
	cookie_date.setTime(cookie_date.getTime() - 60);
	document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

function get_cookie(cookie_name) {
	var results = document.cookie.match ( '(^|;) ?' + cookie_name + '=([^;]*)(;|$)' );

	if (results) {
		return (unescape(results[2]));
	} else {
		return null;
	}
}