function call_viewer(id){ //사진 뷰어 불러오기
        $('#photo_view').load('/index.php/pboard/viewer/'+id, function(){ //사진페이지가 로드가 안전히 되면 브라우저 화면 가운데로 띄우기                  
                var obj = $('#photo_view');
                var photo_view_height = ($(window).scrollTop() + ($(window).height() - obj.height())/2);
                var photo_view_width = ($(window).scrollLeft() + ($(window).width() - obj.width())/2);
                                        
                obj.css({
                        position: 'absolute',
                        display : 'block',
                        top : photo_view_height,
                        left : photo_view_width
                });
                        
                set_coverup();
                $('#photo_view').fadeIn();
        });
}