parse error in function

Hello!

I have problem with my function and I can find what's wrong.

WARNING: Error occurred while executing PL/pgSQL function fn_insert_entry_pending
WARNING: line 26 at SQL statement
ERROR: parser: parse error at or near "$1" at character 58

create or replace function "fn_insert_entry_pending"(varchar,varchar,varchar,varchar,varchar,boolean,boolean,date,int,int) returns integer as '
declare
email alias for $1;
caption alias for $2;
description alias for $3;
keywords alias for $4;
url alias for $5;
is_company alias for $6;
is_novelty alias for $7;
expire alias for $8;
category1 alias for $9;
category2 alias for $10;
tmp record;
id_entry_tmp integer;

begin
SELECT INTO tmp id_user FROM "user" WHERE id_user = email;
if not found then
execute ''INSERT INTO "user" (id_user) VALUES ('' || quote_literal(email) || '')'';
end if;
select into id_entry_tmp id_entry from "directory_entry" where url=url and is_novelty=is_novelty;

DELETE FROM "directory_entry_pending" WHERE "url"=url and "id_entry"=id_entry_tmp and "is_novelty"=is_novelty;

INSERT INTO "directory_entry_pending" (id_entry,id_user,caption,url,is_company,is_novelty,expire,hash) VALUES (id_entry_tmp,$1,$2,$5,$6,$7,$8,''1'');

return 1;
end;
' language 'plpgsql';