autentication problem

Hi everyone

i am working on php and posgresql, i designed a database system web oriented
on windows at first on template1 default database. I used a password and a
loggin
loggin=postgres
password=13177337
this info is requested when installing postgresql on windows.
Know i trying  to migrate to suse linux...i moved my scripts to
srv/www/htdocs/prototipo as root. I installed apache2 server, and i
configured both apache and posgtresql to start running when starting the
computer.

The problem is, i have not been able tu run properly the system on linux...i
receive the following message when conecting to postgresql:

"Warning: pg_connect(): Unable to connect to PostgreSQL server: FATAL: la
autentificación Ident falló para el usuario «jufl» in
/srv/www/htdocs/Prototipo/opciones.php on line 51"

I didnt create any user when installing postgres, it didnt request during
installation...so i wonder....how can i manage this? the extrange thing is
that  i can modify tables from console as follows;


...............................................................................................................................................................
su root
enter password
su postgres
psql prototipo
Bienvenido a psql 8.0.3, el terminal interactivo de PostgreSQL.

Digite:  \copyright para ver los términos de distribución
         \h para obtener ayuda sobre comandos SQL
         \? para obtener ayuda sobre comandos internos
         \g o punto y coma (;) para ejecutar consulta
         \q para salir

prototipo=#


.....................................................................................................................................................................................


so i dont understand what the problem is.....

Thaks for your help...