Setting a cookie with JavaScript which expires after 24 hours

Setting a cookie with JavaScript which expires after 24 hours

How do I run this function, so that the cookie expires in 24 hours?

function createCookie( 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=/";
}


Thanks