var randomNumbers = new Array();

this.randomtip = function () {

    var length = $("#latestDev div").length;

    for (i = 1; i <= length; i++) {
        $("#latestDev div:nth-child(" + i + ")").hide();
        randomNumbers.push(0);
    }
    // #1 always shown
    randomNumbers[0] = 1;
    $("#latestDev div:nth-child(1)").show();

    for (j = 0; j < 3; j++) {
        var ran = getNewContent(length) + 1;
        $("#latestDev div:nth-child(" + ran + ")").show();
    }

};

$(document).ready(function () {
    randomtip();
});

function getNewContent(length) {

    var newRandomNumber = Math.floor(Math.random() * length);
    var tmpStr = "";

    for (i = 0; i < randomNumbers.length; i++) {
        tmpStr += i + ":" + randomNumbers[i] + "  ";
    }

    if (randomNumbers[newRandomNumber] == 0) {
        randomNumbers[newRandomNumber] = 1;
        return newRandomNumber;
    }
    else {
        return getNewContent(length);
    }

}