don't know how to get SELECT

Hi!

i have some problems with plpgsql. Here is my function

create or replace function rm_cat(varchar,int) returns boolean as '
declare
table alias for $1;
id alias for $2;
data RECORD;
begin
******************************************************************
SELECT INTO data lft,rgt FROM d_categories WHERE id_category=id;
******************************************************************
IF NOT FOUND THEN
RAISE EXCEPTION ''id % does not exist'',id;
return 0;
end if;

-- deleting the leftmost node does not lower lft for all
execute ''update '' || quote_ident(table) || '' set level=level-1 where lft > '' || data.lft || ''and rgt < '' || data.rgt || '';'';
execute ''update '' || quote_ident(table) || '' set lft=lft-1 where lft >= '' || data.lft || '';'';
execute ''update '' || quote_ident(table) || '' set lft=lft-1 where lft >= '' || data.rgt || '';'';
execute ''update '' || quote_ident(table) || '' set rgt=rgt-1 where rgt >= '' || data.lft || '';'';
execute ''update '' || quote_ident(table) || '' set rgt=rgt-1 where rgt >= '' || data.rgt || '';'';
execute ''delete from '' || quote_ident(table) || '' where id_category = '' || id || '';'';
return 1;
end;
'language 'plpgsql';

My problems is in line wraped with ***. What i want is that
SELECT have to be dinamyc because i want with an argument to
saj for what table do this select. I tried many ways and i
think i don't understand something. Can somebody help me
solve this.

--
bye,
Uros mailto:uros(dot)gruber(at)sir-mag(dot)com