diff -aur mysqlcompat-1.0b3.orig/datetime.sql mysqlcompat-1.0b3/datetime.sql
--- mysqlcompat-1.0b3.orig/datetime.sql	2005-12-10 06:26:53.000000000 +0100
+++ mysqlcompat-1.0b3/datetime.sql	2008-09-18 16:42:02.000000000 +0200
@@ -503,6 +503,11 @@
   SELECT $3 + ($2 operator(pg_catalog.||) ' ' operator(pg_catalog.||) $1)::interval
 $$ IMMUTABLE STRICT LANGUAGE SQL;
 
+CREATE OR REPLACE FUNCTION timestampadd(text, integer, timestamp with time zone)
+RETURNS timestamp with time zone AS $$
+  SELECT $3 + ($2 operator(pg_catalog.||) ' ' operator(pg_catalog.||) $1)::interval
+$$ IMMUTABLE STRICT LANGUAGE SQL;
+
 -- TIMESTAMPDIFF()
 -- Note that first parameter needs to be quoted in this version
 
@@ -650,10 +655,10 @@
 RETURNS text AS $$
   SELECT CASE
     WHEN EXTRACT(WEEK FROM $1)::integer = 53 THEN
-      pg_catalog.lpad(EXTRACT(YEAR FROM $1) - 1, 4, '0') || '53'
+      pg_catalog.lpad((EXTRACT(YEAR FROM $1) - 1)::text, 4, '0') || '53'
     ELSE
-      pg_catalog.lpad(EXTRACT(YEAR FROM $1) - 1, 4, '0')
-        || pg_catalog.lpad(EXTRACT(WEEK FROM $1), 2, '0')
+      pg_catalog.lpad((EXTRACT(YEAR FROM $1) - 1)::text, 4, '0')
+        || pg_catalog.lpad(EXTRACT(WEEK FROM $1)::text, 2, '0')
     END
 $$ IMMUTABLE STRICT LANGUAGE SQL;