$(function () {
    if ($(".flag-dialog").length > 0) { // check if this block is even necessary for the current page
        $(document).on("click", ".flag-dialog button.c", function () {
            ui.modalDialog.close(".flag-dialog");
            return false;
        });
        // more code...
    }
});
$(function () {
    if ($(".comment-section").length > 0) { // check if this block is even necessary for the current page
        $(document).on("click", ".comment-section button.s", function () {
            // ....
        });
        // more code...
    }
});