function visit(arg){


if (arg == 'a'){document.location = "liste.php?categorie=centraux";}
else if (arg == 'b'){document.location = "liste.php?categorie=appareils";}
else if (arg == 'c'){document.location = "liste.php?categorie=accessoires";}
else if (arg == 'd'){document.location = "liste.php?categorie=lignes";}

else if (arg == 'e'){document.location = "solution-flexitel.php";}
else if (arg == 'f'){document.location = "solution-ip.php";}
else if (arg == 'g'){document.location = "solution-mixte.php";}
else if (arg == 'h'){document.location = "solution-classique.php";}
else if (arg == 'i'){window.open("pdf/prospectus.pdf");}

else {
var urldest;
urldest = "produit.php?id=";
document.location = urldest+arg;
}

}