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

/* menu entete */
function changeImages(img_id, img_url)
{
	if (document.images && (preloadFlag == true)) 
		document.getElementById(img_id).src = img_url;
}

/* prechargement */
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		var envoyer_over = newImage("/searchengine/bt_rechercher_over.gif");
		preloadFlag = true;
	}
}