function showDialog(title, body, focus)
{
    $("#dialog").dialog({
        modal: true,
        position: 'center',
        title: title,

        close: function(event, ui) {
                $('#dialog').dialog('destroy');
                if (focus)
                    $(focus).focus();
        },
        open: function(event, ui) {
            $('#dialog-body').html(body);
        },
        buttons: {
            "Ok": function() { $(this).dialog("close")}
        }

    });

    $('#dialog').dialog('open');
}