var divs = $('#divs > div'),
    output = $('#output'),
    tarr = [0, 0, 0, 0],
    delay = 100;

divs.click(function() {
    $(this).addClass('selected').siblings().removeClass('selected');
    console.log("track!");
});

setInterval(function() {
    var idx = divs.filter('.selected').index();
    tarr[idx] = tarr[idx] + delay;
    output.text('Times (in ms): ' + tarr);
    //console.log('Times (in ms): ' + tarr);
}, delay);

$(function(){
        $("#test").on("submit", function(event) {
            event.preventDefault();
        console.log('Times (in ms): ' + tarr);
        tarrString = tarr.toString();

            $.ajax({
                url: "next.php",
                type: "post",
                data: {tarr: tarrString},
                dataType: "text",
                success: function(d) {
                    //alert(d);
                }
            });
        });
    })