<script type="text/javascript">
     $(document).ready(function(){


        // setup the modal dialog
        $("#dialog").dialog({
            autoOpen: false,
            modal: true,
            resizable: false
        });

        $("#dialog").dialog({
            buttons: {
                "Yes": function() {
                    userConfirmed = true;
                    $("#inputform").submit();
                },
                "No, I'll change them.": function() {
                    $(this).dialog("close");
                    $('#totalDays').focus();
                }
            }
        });

        var userConfirmed = false;

        // check they've submitted what they need to
        $("form").submit(function(e) {

            $("#dialog").dialog("open");

            return userConfirmed;

        });

    });
</script>

<form method="POST" action="<?php echo CURRENT_PAGE ?>" name="inputform" id="inputform">
        <div class="buttons">
            <button type="submit" name="submit" id="submit">Submit form</button>
        </div>
    </div>

</form>