if(document.images)
			{
			lexique_img = new Image;
			lexique_img = "../img/tt_lexique-over.gif";
			selections_img = new Image;
			selections_img = "../img/tt_selections-over.gif";
			expo_img = new Image;
			expo_img = "../img/tt_DansExpo-over.gif";
			actualite_img = new Image;
			conference_img = "../img/tt_conference-over.gif";
			conference_img = new Image;
			actualite_img = "../img/tt_actualite-over.gif";
			}