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)