--- a/jack_functions.py
+++ b/jack_functions.py
@@ -219,9 +219,9 @@
     ff = blocks % CDDA_BLOCKS_PER_SECOND
     return mm, ss, ff, blocks

-def starts_with(str, with):
-    "checks whether str starts with with"
-    return str[0:len(with)] == with
+def starts_with(str, withstr):
+    "checks whether str starts with withstr"
+    return str[0:len(withstr)] == withstr