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) {
		bt_home_over = newImage("images/bt_home_over.gif");
		bt_history_over = newImage("images/bt_history_over.gif");
		bt_prestige_over = newImage("images/bt_prestige_over.gif");
		bt_choosing_over = newImage("images/bt_choosing_over.gif");
		bt_contact_over = newImage("images/bt_contact_over.gif");
		bt_francais_over = newImage("images/bt_francais_over.gif");
		bt_position_over = newImage("images/bt_position_over.gif");
		bt_paper_over = newImage("images/bt_paper_over.gif");
		bt_quantities_over = newImage("images/bt_quantities_over.gif");
		bt_order_over = newImage("images/bt_order_over.gif");
		preloadFlag = true;
	}
}