function mark(id, title, marks) {

        try {

            $('<form id="submit-form" method="get" action="Script.php">'
	      + title + ' (' + marks + ' marks)' +
	      '<input type="hidden" name="savemarks" value="true">\n\ <input type="hidden" name="total" value="' + marks + '" > <input type="hidden" name="id" value="' + id + '" ><br> Marks <input type="text" name="marks">\n\
 Comments <textarea name="feedback"></textarea>  \n\
<input type="hidden" name="labid" value="<?php echo $course_id; ?>"> <input type="hidden" name="header" value="<?php echo $header; ?>">  </form>').dialog({
                modal: true,
                title: 'Mark submission',
                buttons: {
                    'Submit': function() {
                        $('#submit-form').submit();
                        $(this).dialog('close');
                    },
                    'Cancel': function() {
                        $(this).dialog('close');
                    }

                }
            });

        } catch (e) {
            alert(e);
        }
    }