var navVersion = navigator.appVersion.substring(0,1);
if (navVersion >= 3)
{

im1 = new Image;
im1 = "../images/img_commun/nav_institut_2.gif";
im2 = new Image;
im2 = "../images/img_commun/nav_reseau_2.gif";
im3 = new Image;
im3 = "../images/img_commun/nav_thematiques_2.gif";
im4 = new Image;
im4 = "../images/img_commun/nav_ressources_2.gif";
im5 = new Image;
im5 = "../images/img_commun/nav_agenda_2.gif";
im6 = new Image;
im6 = "../images/img_commun/nav_communiques_2.gif";
im7 = new Image;
im7 = "../images/img_commun/nav_conference_2.gif";
im8 = new Image;
im8 = "../images/img_commun/nav_contacts_2.gif";

}