The file that I would like to convert to GPX format is
locate_GPS_export_csv_2008_12_25.csv

This file has been created by a program hosted on http://www.locate-gps.com
This application allows me to track somebody of my family, with Alzheimer desease. He wears a GPS receiver / GSM emitter and receiver (Lommy, from Flextrack), and his position is recorded and displayed via http://www.locate-gps.com
The problem is that this website only keeps the data for one month.
I would like to save some of them, and to put them in GPX format.

The problem is that I have not been able to convert this CSV file using http://www.gpsvisualizer.com/convert_input.
The failure is probably due to the bad latitude and longitude formats in this CSV file:
node_id;latitude;longitude;date;time;vitesse;direction;voltage;etat_chargement;appel_urgence;hdop;auxiliaire;adresse
1071116004;N43.31.4944;E5.26.6385;2008-12-09;11:23:44;5;226;4038;0;0;25;0;Aix-en-Provence,FR
1071116004;N43.31.4434;E5.26.5753;2008-12-09;11:28:47;0;255;4032;0;0;11;0;Aix-en-Provence,FR
1071116004;N43.30.8857;E5.26.5572;2008-12-09;11:33:49;0;213;4032;0;0;12;0;Aix-en-Provence,FR

According to http://www.gpsvisualizer.com/tutorials/waypoints.html, I have tried to convert these data from
N43.31.4944  to
43.31.4944   and to
43-31-4944   and to
43 31 4944
but it does not work.

The track should look like


and a zoomed area should look like:



Adam gave me the solution: 
You can fix it by replacing the first decimal point with a space.  So this:
N43.31.4944;E5.26.6385
...becomes this:
N43 31.4944;E5 26.6385

That's great!
Moreover, using 
http://www.gpsvisualizer.com/map_input
allows to build an interactive map that you can access with this link, or display in a page, like below, using a frame




Idem, mais avec chaque position marquée par un cercle, qui affiche l'heure quand on passe le pointeur de la souris dessus.
Cette carte a été créée avec ces paramètres.
Attention: au moment de sauver le fichier html, le sauver en texte seulement (et pas en "page web complète").




THANK'S Adam !!!