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var start = new Date().getTime(),
    time = 0,
    elapsed = '0.0';

function instance()
{
    time += 100;

    elapsed = Math.floor(time / 100) / 10;
    if(Math.round(elapsed) == elapsed) { elapsed += '.0'; }

    document.title = elapsed;

    var diff = (new Date().getTime() - start) - time;
    window.setTimeout(instance, (100 - diff));
}

window.setTimeout(instance, 100);