function rollOverTab(baseId, isOver) {
	// Récupération des objets
	var left = getObj(baseId+"_g");
	var center = getObj(baseId+"_m");
	var right = getObj(baseId+"_d");
	
	// Changement de la classe
	if (isOver) {
		left.className="g overG";
		center.className="m overM";
		right.className="d overD";
	}
	else {
		left.className="g";
		center.className="m";
		right.className="d";
	}
	
	return true;
}