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//  With JavaScript, a cookie can be created like this:
document.cookie = "username=John Doe";

//  You can also add an expiry date (in UTC time). By default, the cookie is deleted when the browser is closed:
document.cookie = "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC";

//  With a path parameter, you can tell the browser what path the cookie belongs to. By default, the cookie belongs to the current page.
document.cookie = "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC; path=/";

//  With JavaScript, cookies can be read like this:
var x = document.cookie;

//  With JavaScript, you can change a cookie the same way as you create it:
document.cookie = "username=John Smith; expires=Thu, 18 Dec 2013 12:00:00 UTC; path=/";

//  Deleting a cookie is very simple. Just set the expires parameter to a passed date:
document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC";