if(document.images)
{
iparc = new Image;
iparc = "../bouton/oiseaux-de-parc-et-aquatiques-h.gif";
icobaye = new Image;
icobaye = "../bouton/cobaye-h.gif";
ivolaillen = new Image;
ivolaillen = "../bouton/volaille-naine-h.gif";
ivolailleg = new Image;
ivolailleg = "../bouton/volaille-grande-h.gif";
ipigeon = new Image;
ipigeon = "../bouton/pigeon-h.gif";
ihome = new Image;
ihome = "../bouton/home-h.gif";
iprevious = new Image;
iprevious = "../bouton/precedent-h.gif";
ilapin = new Image;
ilapin = "../bouton/lapin-h.gif";
itel = new Image;
itel = "../bouton/telechargement-h.gif";
iretour = new Image;
iretour = "../bouton/retour-h.gif";

}