img21_on = new Image();

img21_on.src = "images/histoirel2_over.gif";

img21_off = new Image();

img21_off.src = "images/histoirel2_off.gif";



img22_on = new Image();

img22_on.src = "images/guerres_over.gif";

img22_off = new Image();

img22_off.src = "images/guerres_off.gif";



img23_on = new Image();

img23_on.src = "images/paix_over.gif";

img23_off = new Image();

img23_off.src = "images/paix_off.gif";


img24_on = new Image();

img24_on.src = "images/oslo_over.gif";

img24_off = new Image();

img24_off.src = "images/oslo_off.gif";



img25_on = new Image();

img25_on.src = "images/cartes_over.gif";

img25_off = new Image();

img25_off.src = "images/cartes_off.gif";