Latency meter

HTML

<img id="junkOne" />
<p id="timer"></p>

JavaScript

var start = new Date().getTime();
$('#junkOne').attr('src', 'http://206.191.155.104:444/').error(function () {
    var end = new Date().getTime();
    $('#timer').html("" + (end-start) + "ms");
});