Get value of the given cookie, or empty string if not found.

get-cookie-value.js

function getCookieValue(key) {
    currentcookie = document.cookie;
    if (currentcookie.length > 0)
    {
        firstidx = currentcookie.indexOf(key + "=");
        if (firstidx != -1)
        {
            firstidx = firstidx + key.length + 1;
            lastidx = currentcookie.indexOf(";",firstidx);
            if (lastidx == -1)
            {
                lastidx = currentcookie.length;
            }
            return unescape(currentcookie.substring(firstidx, lastidx));
        }
    }
    return "";
}