id field error

Hi !
I´m doing my first publishing system for a last aquired boooks for a library.

the problem begin in the id field, wich i choose to be primary key and unique.
i could just insert data one time the others give me this error:

Cannot insert a duplicate key into unique index biblioteca_pkey

i use this piece of code below to insert the data:

$query = "INSERT INTO biblioteca (id, autor, titulo, editora) values ('$id',
'$autor', '$titulo', '$editora')";
$result = pg_exec($db, $query);

may i can alter the id collumn and the query to insert the data anybody
knows what exactly to do ?

Thank´s

Ângelo

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