localData

QQ.localData = {
    userData: null,
    name: location.hostname,
    isLocalStorage: typeof localStorage == 'undefined'?false:true,
    init: function(){
        if (!this.userData) {
            try {
                this.userData = document.createElement('INPUT');
                this.userData.type = "hidden";
                this.userData.style.display = "none";
                this.userData.addBehavior ("#default#userData");
                document.body.appendChild(this.userData);
                var expires = new Date();
                expires.setDate(expires.getDate()+365);
                this.userData.expires = expires.toUTCString();
            } catch(e) {
                return false;
            }
        }
        return true;
    },
    set: function(key, value) {
        if(this.isLocalStorage){
            localStorage.setItem(key, value);
        }
        else if(this.init()){
            this.userData.load(this.name);
            this.userData.setAttribute(key, value);
            this.userData.save(this.name);
        }
    },
    get: function(key) {
        if(this.isLocalStorage){
            return localStorage.getItem(key);
        }
        else if(this.init()){
            this.userData.load(this.name);
            return this.userData.getAttribute(key)
        }
        return null;
    },
    remove: function(key) {
        if(this.isLocalStorage){
            localStorage.removeItem(key);
        }
        else if(this.init()){
            this.userData.load(this.name);
            this.userData.removeAttribute(key);
            this.userData.save(this.name);
        }
    }
};