var timer = {        timerId : 0,        timers : [],                add : function(fn){            this.timers.push(fn);        },                start : function(){            if(this.timerId){                return;            }            (function runNext(){                if(timer.timers.length > 0){                    for(var i = 0; i < timer.timers.length; i++){                        if(timer.timers[i]() === false){                            timer.timers.splice(i,1);                            i--;                        }                    }                    timer.timerId = setTimeout(runNext,0);                }            })();        },                stop : function(){            clearTimeout(this.timerId);            this.timerId = 0;        }};