deleting function

Dear Friends

I have table called below
I need to delete the record by using id value of the table
For that I wrote below function

create or replace function newd(id integer ) returns void as $$
begin
delete from testing where id=$1;
end;
$$
language 'plpgsql';

Here I call the function as " select newd(100) "

But it is deleting every things from the table

My doubt is , why it was deleting every thing , even I gave the
single value in function .

pavunkumar=> \d testing;
Table "hospital.testing"
Column | Type | Modifiers
---------+-------------------+-----------
id | integer | not null
name | character varying |
address | character varying |
Indexes:
"testing_pkey" PRIMARY KEY, btree (id)