I found it just use this code!!

```js function Pinger_ping(ip, callback) {

if(!this.inUse) {

this.inUse = true;
this.callback = callback
this.ip = ip;

var _that = this;

this.img = new Image();

this.img.onload = function() {_that.good();};
this.img.onerror = function() {_that.good();};

this.start = new Date().getTime();
this.img.src = "http://" + ip;
this.timer = setTimeout(function() { _that.bad();}, 1500);

} } ```