$(document).ready(initialiser);

function initialiser() {
	$(".nv1").mouseover(afficherNv2);
}

function afficherNv2() {
	var theId = $(this).attr('id');
	switch (theId) {
		case "etu" :
			$(".nv2").css({"display" : "none"});
			$("#etu .nv2").css({"display":"block"});
			break;
		case "etp" :
			$(".nv2").css({"display" : "none"});
			$("#etp .nv2").css({"display":"block"});
			break;
		case "for" :
			$(".nv2").css({"display" : "none"});
			$("#for .nv2").css({"display":"block"});
			break;
		case "int" :
			$(".nv2").css({"display" : "none"});
			$("#int .nv2").css({"display":"block"});
			break;
		default :
			$(".nv2").css({"display" : "none"});
			break;
	} 
}

/*window.addEventListener("load",initialiser,false);

function initialiser() {
	doument.getElementsByTagName(".nv1").addEventListener("click", afficher, false);
}

function afficher() {
	console.log("test");
}*/