insert values

Hi,

I have the following type :
--------------------------------------------
CREATE FUNCTION entier_in(opaque)
RETURNS entier
AS '/ens/klimann/PostgreSQL/entier.o'
LANGUAGE 'c';

CREATE FUNCTION entier_out(opaque)
RETURNS opaque
AS '/ens/klimann/PostgreSQL/entier.o'
LANGUAGE 'c';

CREATE TYPE entier (
internallength = 8,
input = entier_in,
output = entier_out
);
--------------------------------------------

where entier.c is the following program :
--------------------------------------------
#include <stdio.h>

typedef struct entier {
long x;
} entier;

entier * entier_in(char *s)
{
entier *result;

result = (entier *)malloc(sizeof(entier));
result->x = atoi(s);

return (result);
}

char * entier_out(entier *n)
{
char *result;
if (n == NULL)
return(NULL);
result = (char *) malloc(60);
sprintf(result, "%d", n->x);

return(result);
}
----------------------------------------------

then I create the table entiers as follows :
----------------------------------------------
CREATE TABLE entiers (
val entier
);
----------------------------------------------

How can I insert a value in this table ?

I have tried several methods, but I can't find
a correct one.

Does someone have an idea ?

Thanks a lot,
Ines.