var proposUp = new Image();
proposUp.src = "/skin/en/images/nav_princ/bt_about_up.gif";

var proposRoll = new Image();
proposRoll.src = "/skin/en/images/nav_princ/bt_about_roll.gif";

var introUp = new Image();
introUp.src = "/skin/en/images/nav_sec/bt_introduction_up.gif";

var introRoll = new Image();
introRoll.src = "/skin/en/images/nav_sec/bt_introduction_roll.gif";

var infrastructuresUp = new Image();
infrastructuresUp.src = "/skin/en/images/nav_sec/bt_facilities_up.gif";

var infrastructuresRoll = new Image();
infrastructuresRoll.src = "/skin/en/images/nav_sec/bt_facilities_roll.gif";

var contactsUp = new Image();
contactsUp.src = "/skin/en/images/nav_sec/bt_contacts_up.gif";

var contactsRoll = new Image();
contactsRoll.src = "/skin/en/images/nav_sec/bt_contacts_roll.gif";

var personnesUp = new Image();
personnesUp.src = "/skin/en/images/nav_princ/bt_people_up.gif";

var personnesRoll = new Image();
personnesRoll.src = "/skin/en/images/nav_princ/bt_people_roll.gif";

var personnelUp = new Image();
personnelUp.src = "/skin/en/images/nav_sec/bt_staff_up.gif";

var personnelRoll = new Image();
personnelRoll.src = "/skin/en/images/nav_sec/bt_staff_roll.gif";

var professeursUp = new Image();
professeursUp.src = "/skin/en/images/nav_sec/bt_faculty_up.gif";

var professeursRoll = new Image();
professeursRoll.src = "/skin/en/images/nav_sec/bt_faculty_roll.gif";

var etudiantsUp = new Image();
etudiantsUp.src = "/skin/en/images/nav_sec/bt_students_up.gif";

var etudiantsRoll = new Image();
etudiantsRoll.src = "/skin/en/images/nav_sec/bt_students_roll.gif";

var rechercheUp = new Image();
rechercheUp.src = "/skin/en/images/nav_princ/bt_research_up.gif";

var rechercheRoll = new Image();
rechercheRoll.src = "/skin/en/images/nav_princ/bt_research_roll.gif";

var projetsThemeUp = new Image();
projetsThemeUp.src = "/skin/en/images/nav_sec/bt_projectsDomain_up.gif";

var projetsThemeRoll = new Image();
projetsThemeRoll.src = "/skin/en/images/nav_sec/bt_projectsDomain_roll.gif";

var projetsCollaborUp = new Image();
projetsCollaborUp.src = "/skin/en/images/nav_sec/bt_projectsCollabor_up.gif";

var projetsCollaborRoll = new Image();
projetsCollaborRoll.src = "/skin/en/images/nav_sec/bt_projectsCollabor_roll.gif";

var publicationsUp = new Image();
publicationsUp.src = "/skin/en/images/nav_princ/bt_publications_up.gif";

var publicationsRoll = new Image();
publicationsRoll.src = "/skin/en/images/nav_princ/bt_publications_roll.gif";

var parProjetUp = new Image();
parProjetUp.src = "/skin/en/images/nav_sec/bt_byProject_up.gif";

var parProjetRoll = new Image();
parProjetRoll.src = "/skin/en/images/nav_sec/bt_byProject_roll.gif";

var parThemeUp = new Image();
parThemeUp.src = "/skin/en/images/nav_sec/bt_byDomain_up.gif";

var parThemeRoll = new Image();
parThemeRoll.src = "/skin/en/images/nav_sec/bt_byDomain_roll.gif";

var parDateUp = new Image();
parDateUp.src = "/skin/en/images/nav_sec/bt_byDate_up.gif";

var parDateRoll = new Image();
parDateRoll.src = "/skin/en/images/nav_sec/bt_byDate_roll.gif";

var evenementsUp = new Image();
evenementsUp.src = "/skin/en/images/nav_princ/bt_events_up.gif";;

var evenementsRoll = new Image();
evenementsRoll.src = "/skin/en/images/nav_princ/bt_events_roll.gif";

var seminairesUp = new Image();
seminairesUp.src = "/skin/en/images/nav_sec/bt_seminars_up.gif";

var seminairesRoll = new Image();
seminairesRoll.src = "/skin/en/images/nav_sec/bt_seminars_roll.gif";

var conferencesUp = new Image();
conferencesUp.src = "/skin/en/images/nav_sec/bt_conferences_up.gif";

var conferencesRoll = new Image();
conferencesRoll.src = "/skin/en/images/nav_sec/bt_conferences_roll.gif";

var autresUp = new Image();
autresUp.src = "/skin/en/images/nav_sec/bt_others_up.gif";

var autresRoll = new Image();
autresRoll.src = "/skin/en/images/nav_sec/bt_others_roll.gif";

var profilUp = new Image();
profilUp.src = "/skin/en/images/nav_princ/bt_profile_up.gif";

var profilRoll = new Image();
profilRoll.src = "/skin/en/images/nav_princ/bt_profile_roll.gif";

var informationsUp = new Image();
informationsUp.src = "/skin/en/images/nav_sec/bt_informations_up.gif";

var informationsRoll = new Image();
informationsRoll.src = "/skin/en/images/nav_sec/bt_informations_roll.gif";

var profilPublicationsUp = new Image();
profilPublicationsUp.src = "/skin/en/images/nav_sec/bt_publications_up.gif";

var profilPublicationsRoll = new Image();
profilPublicationsRoll.src = "/skin/en/images/nav_sec/bt_publications_roll.gif";

var profilProjetsUp = new Image();
profilProjetsUp.src = "/skin/en/images/nav_sec/bt_projects_up.gif";

var profilProjetsRoll = new Image();
profilProjetsRoll.src = "/skin/en/images/nav_sec/bt_projects_roll.gif";