JavaScript - Why second time only ping ip address in javascript ?

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 function submitbtn_click() {
                var serverip = "192.168.168.1"
 
                if (serverip != "") {
                    var ImageObject = new Image();
                    ImageObject.src = "http://" + serverip + "/Services/images/Main/bar.gif"; 
 
                    if (ImageObject.height > 0)
                  {
                   alert("Success");
                    } else {
 
                         alert("Fail");
                    }
                }
                else {
                    alert("Server IP should not be empty");
                }
 
            }
        }