CookieUtil & SubCookieUtil

var CookieUtil = {
    get: function(name){
        var cookieName = encodeURIComponent(name) + "=",
               cookieStart = document.cookie.indexOf(cookieName),
               cookieValue = null;
        if( cookieStart > -1 ){
            var cookieEnd = document.cookie.indexOf(";", cookieStart);
            if( cookieEnd == -1 ){
                cookieEnd = document.cookie.length;
            }
            cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length , cookieEnd));
        }
        return cookieValue;
    },
    set: function(name, value, expires, path, domain, secure){
        var cookieText = encodeURIComponent(name) + "=" +
                                      encodeURIComponent(value);
        if(expires instanceof Date){
            cookieText += "; expires=" + expires.toGMTString();
        }
        if(path){
            cookieText += "; path=" + path;
        }
        if(domain){
            cookieText += "; domain=" + domain;
        }
        if(secure){
            cookieText += "; secure";
        }
        document.cookie = cookieText;
    },
    unset: function(name, path, domain, secure){
        this.set(name, " ", new Date(0), path, domain, secure);
    }
}

var SubCookieUtil = {
    get: function(name, subName){
        var subCookies = this.getAll(name);
        if(subCookies){
            return subCookies[subName];
        } else {
            return null;
        }
    },
    getAll: function(name){
        var cookieName = encodeURIComponent(name) + "=",
               cookieStart = document.cookie.indexOf(cookieName),
               cookieValue = null,
               result = {};
        if(cookieStart > -1){
            var cookieEnd = document.cookie.indexOf(";", cookieStart);
            if(cookieEnd == -1){
                cookieEnd = document.cookie.length;
            }
            cookieValue = document.cookie.substring(cookieStart + cookieName.length, cookieEnd);
            if(cookieValue.length > 0){
                var subCookies = cookieValue.split("&");
                for(var i=0, len=subCookies.length;i < len; i++){
                    var parts = subCookies[i].split("=");
                    result[decodeURIComponent(parts[0])] = decodeURIComponent(parts[1]);
                }
                return result;
            }
        }
        return null;
    },
    set: function(name, subName, value, expires, path, domain, secure){
        var  subCookies = this.getAll(name) || {};
        subCookies[subName] = value;
        this.setAll(name, subCookies, expires, path, domain, secure);
    },
    setAll: function(name, subCookies, expires, path, domain, secure){
        var cookieText = encodeURIComponent(name) + "=";
        var subCookieParts = new Array();
        for(var subName in subCookies){
            if(subName.length > 0 && subCookies.hasOwnProperty(subName)){
                subCookieParts.push(encodeURIComponent(subName) + "=" +
                encodeURIComponent(subCookies[subName]));
            }
        }
        if(cookiesParts.length > 0){
            cookieText += subCookieParts.join("&");
            if(expires instanceof Date){
                cookieText += "; expires=" + expires.toGMTString();
            }
            if(path){
                cookieText += "; path=" + path;
            }
            if(domain){
                cookieText += "; domain=" + domain;
            }
            if(secure){
                cookieText += "; secure";
            }
        } else {
            cookieText += "; expires=" + (new Date(0).toGMTString());
        }
        document.cookie = cookieText;
    },
    unset: function(name, subName, path, domain, secure){
        var subCookies = this.getAll(name);
        if(subCookies){
            delete subCookies[subName];
            this.setAll(name, subCookies, null, path, domain, secure);
        }
    },
    unsetAll: function(name, path, domain, secure){
        this.setAll(name, null, new Date(0), path, domain, secure);
    }
}