var linkwjpg = $("#blurpost").attr("src").split("/").pop().split(".", 1);
$("h1").text(linkwjpg);
var myInterval = setInterval(function () {
    $.ajax({
        url: 'time.php',
        type: 'post',
        data: {'user':'<?php echo $_SESSION["login"] ?>','topost':'momo_1'},
        success: function() {

        }
    });
}, 1000);

var linkwjpg = $("#blurpost").attr("src").split("/").pop().split(".", 1);
$("h1").text(linkwjpg);
var myInterval = setInterval(function () {
    $.ajax({
        url: 'time.php',
        type: 'post',
        data: {'user':'<?php echo $_SESSION["login"] ?>','topost':linkwjpg},
        success: function() {

        }
    });
}, 1000);

topost%5B%5D=momo_1  // topost[]=momo_1 (https://jsfiddle.net/5k6jtew2/)

var linkwjpg = $("#blurpost").attr("src").split("/").pop().split(".", 1)[0];

data: {'user':'<?php echo $_SESSION["login"] ?>','topost':linkwjpg[0]}