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(ptr) {
	if (document.images) {
		menu_01_over = newImage(ptr+"img/menu_01-over.jpg");
		menu_02_over = newImage(ptr+"img/menu_02-over.jpg");
		menu_03_over = newImage(ptr+"img/menu_03-over.jpg");
		menu_04_over = newImage(ptr+"img/menu_04-over.jpg");
		menu_05_over = newImage(ptr+"img/menu_05-over.jpg");		
		left_01_over = newImage(ptr+"img/left_01-over.png");
		left_02_over = newImage(ptr+"img/left_02-over.png");
		left_03_over = newImage(ptr+"img/left_03-over.png");
		left_04_over = newImage(ptr+"img/left_04-over.png");
		left_05_over = newImage(ptr+"img/left_05-over.png");
		left_06_over = newImage(ptr+"img/left_06-over.png");
		preloadFlag = true;
	}
}

function rollover(choix, bouton, encours) {
	if (encours==bouton) choix='over';
	var cls = bouton+"_"+choix;
	document.getElementById(bouton).className=cls;
}