function b2loadScript(url, id,callback){
                var script = document.createElement ("script");
                script.type = "text/javascript";
                script.id = id;
                if (script.readyState){
                    script.onreadystatechange = function(){
                        if (script.readyState == "loaded" || script.readyState == "complete"){
                            script.onreadystatechange = null;
                            callback();
                        }
                    };
                } else {
                    script.onload = function(){
                        callback();
                    }
                }
                script.src = url;
                document.getElementsByTagName("head")[0].appendChild(script);
            }
            function b2loadStyle(url, id,callback){
                var script = document.createElement ("link");
                script.type = "text/css";
                script.rel = "stylesheet";
                script.id = id;
                if (script.readyState){
                    script.onreadystatechange = function(){
                        if (script.readyState == "loaded" || script.readyState == "complete"){
                            script.onreadystatechange = null;
                            callback();
                        }
                    };
                } else {
                    script.onload = function(){
                        callback();
                    }
                }
                script.href = url;
                document.getElementsByTagName("head")[0].appendChild(script);
            }
            function b2getCookie(name){
                var nameEQ = name + "=";
                var ca = document.cookie.split(';');
                for(var i=0;i < ca.length;i++) {
                    var c = ca[i];
                    while (c.charAt(0)==' ') c = c.substring(1,c.length);
                    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
                }
                return null;
            }

            function b2setCookie(name,value,days){
                days = days ? days : 100;
                var expires = "";
                if (days) {
                    var date = new Date();
                    date.setTime(date.getTime() + (days*24*60*60*1000));
                    expires = "; expires=" + date.toUTCString();
                }
                document.cookie = name + "=" + (value || "")  + expires + "; path=/";
            }

            function b2delCookie(name){
                document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
            }