function print() {

    var p = document.createElement("p"),

        text = Array.prototype.join.call(arguments, ", ");

    p.textContent = text;

    document.getElementById("console").appendChild(p);

    return text;

}

​

$(function() {

    $(window).scroll(function() {

        var scrollFromTop = $(document).scrollTop();

        $("#console").css("opacity", 1.5-scrollFromTop/250);

    });

});