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) {
		onglet_vol_over = newImage("images/button_vol-over.gif");
		onglet_hotel_over = newImage("images/button_hotel-over.gif");
		preloadFlag = true;
	}
}
function popupWindow (url,resizable,aHeight,aWidth,scrollbars,aLeft,aTop) {
    show = window.open(url,"Informations","resizable="+resizable+",height="+aHeight+",width="+aWidth+",scrollbars="+scrollbars+",left="+aLeft+",top="+aTop);
}