$(document).ready(function() {
    $("#additional-info").hide().ajaxStart(function() {
        if (!$(this).is(":hidden"))
            $(this).slideUp();
    });
});

function toggleAdditionalInfo() {
    if ($("#additional-info").is(":hidden")) {
        $("#additional-info").slideDown();
    } else {
        $("#additional-info").slideUp();
    }
}