getCookie

// v1:

function getCookie(name) {
    var value = "; " + document.cookie;
    var parts = value.split("; " + name + "=");
    if (parts.length == 2) {
        return parts.pop().split(";").shift();
    } else {
        return null;
    }
}

// v2:

function getCookie(name) {
    var dc = "; " + document.cookie,
        prefix = name + "=",
        begin = dc.indexOf("; " + prefix);

    if (begin == -1) {
        return null;
    } else {
        begin += 2;
        var end = dc.indexOf(";", begin);
        if (end == -1) {
            end = dc.length;
        }
    }
    // because unescape has been deprecated, replaced with decodeURI
    //return unescape(dc.substring(begin + prefix.length, end));
    return decodeURI(dc.substring(begin + prefix.length, end));
}