+} /* }}} function zoom_relative */
+
+function zoom_reference (graph_id) /* {{{ */
+{
+ var jq_obj;
+ var end;
+ var begin;
+
+ jq_obj = $("#" + graph_id);
+ if (jq_obj == null)
+ return (false);
+
+ begin = jq_obj.data ('begin');
+ end = jq_obj.data ('end');
+ if ((begin == null) || (end == null))
+ return (false);
+
+ $(".graph-img img").each (function ()
+ {
+ $(this).data ('begin', begin);
+ $(this).data ('end', end);
+ zoom_redraw ($(this));
+ });
+} /* }}} function zoom_reference */