Index: /temp/trunk/html/test/uehara/tree.php
===================================================================
--- /temp/trunk/html/test/uehara/tree.php	(revision 8587)
+++ /temp/trunk/html/test/uehara/tree.php	(revision 8588)
@@ -109,4 +109,7 @@
 		$bytes = 0;
 	}
+	
+	if($bytes == "") $bytes = 0;
+	
     return $bytes; 
 }