Cookies en javascript

function setCookie(key, value, expirydays)

{

var expires = new Date(); expires.setTime(expires.getTime() + (expirydays * 24 * 60 * 60 * 1000)); document.cookie = key + ‘=’ + value + ‘;expires=’ + expires.toUTCString();

}
function getCookie(key) {

var keyValue = document.cookie.match(‘(^|;) ?’ + key + ‘=([^;]*)(;|$)’); return keyValue ? keyValue[2] : null;

}