https://www.thehewittfertilitycentre.org.uk/_frontend/js/shared/prodo-plugins/cookies.js

1function createCookie(name, value, mins, hours, days) {
2    mins = typeof mins !== 'undefined' ? mins : 0;
3    hours = typeof hours !== 'undefined' ? hours : 0;
4    days = typeof days !== 'undefined' ? days : 0;
5
6    mins = mins * 60 * 1000;
7    hours = hours * 60 * 60 * 1000;
8    days = days * 24 * 60 * 60 * 1000;
9    expires = "";
10
11    if (mins !== 0 || hours !== 0 || days !== 0) {
12        //Not a session cookie
13        var date = new Date();
14        date.setTime(date.getTime() + mins + hours + days);
15        expires = "; expires=" + date.toGMTString();
16    }
17
18    //Set the cookie
19    document.cookie = name + "=" + value + expires + "; path=/";
20}
21
22//Look for a cookie based on name
23function getCookie(name) {
24    name = name + "=";
25    var cookies = document.cookie.split(";");
26    for (var i = 0; i < cookies.length; i++) {
27        var c = cookies[i];
28        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
29        if (c.indexOf(name) === 0) return c.substring(name.length, c.length);
30    }
31}
32
33function deleteCookie(name) {
34    document.cookie = name + '=;expires=Thu, 01 Jan 1970 00:00:01 GMT; path=/';
35}