1function ping(ip, callback) {
2
3    if (!this.inUse) {
4        this.status = 'unchecked';
5        this.inUse = true;
6        this.callback = callback;
7        this.ip = ip;
8        var _that = this;
9        this.img = new Image();
10        this.img.onload = function () {
11            _that.inUse = false;
12            _that.callback('responded');
13
14        };
15        this.img.onerror = function (e) {
16            if (_that.inUse) {
17                _that.inUse = false;
18                _that.callback('responded', e);
19            }
20
21        };
22        this.start = new Date().getTime();
23        this.img.src = "http://" + ip;
24        this.timer = setTimeout(function () {
25            if (_that.inUse) {
26                _that.inUse = false;
27                _that.callback('timeout');
28            }
29        }, 1500);
30    }
31}
32var PingModel = function (servers) {
33    var self = this;
34    var myServers = [];
35    ko.utils.arrayForEach(servers, function (location) {
36        myServers.push({
37            name: location,
38            status: ko.observable('unchecked')
39        });
40    });
41    self.servers = ko.observableArray(myServers);
42    ko.utils.arrayForEach(self.servers(), function (s) {
43        s.status('checking');
44        new ping(s.name, function (status, e) {
45            s.status(status);
46        });
47    });
48};
49var komodel = new PingModel(['localhost',
50    'ws-bdimperio8',
51    'ws-bdimperio8.payformance.net',
52    'ws-bdimperio8.payformance.com',
53    'ws-bdimperio8.payspan.com',
54    'ws-bdimperio8/favicon.ico',
55    '127.0.0.1', 
56    'unknown'
57    ]);
58ko.applyBindings(komodel);