function newImage(arg) {
    if (document.images) {
	rslt = new Image();
	rslt.src = arg;
	return rslt;
    }
}

function changeImages() {
    if (document.images && (preloadFlag == true)) {
	for (var i=0; i<changeImages.arguments.length; i+=2) {
	    document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
	}
    }
}

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
	
	/* top */
	acc_over = newImage("pics/sect_btns/bleu/btnb_accueil_over.gif");
	offre_over = newImage("pics/sect_btns/bleu/btnb_offre_over.gif");
	serv_over = newImage("pics/sect_btns/bleu/btnb_serv_over.gif");
	contact_over = newImage("pics/sect_btns/bleu/btnb_contact_over.gif");
	envoie_over = newImage("pics/sect_btns/bleu/btnb_envoie_over.gif");

	/* bottom */
	principe_over = newImage("pics/sect_btns/bleu/btnb_principe_over.gif");
	qui_over = newImage("pics/sect_btns/bleu/btnb_qui_over.gif");
	presse_over = newImage("pics/sect_btns/bleu/btnb_presse_over.gif");
	legal_over = newImage("pics/sect_btns/bleu/btnb_legal_over.gif");
	
	preloadFlag = true;
    }
}