function getElementsByClass( searchClass, domNode, tagName) {
	if (domNode == null) domNode = document;
	if (tagName == null) tagName = '*';
	var el = new Array();
	var tags = domNode.getElementsByTagName(tagName);
	var tcl = " "+searchClass+" ";
	for(i=0,j=0; i<tags.length; i++) {
		var test = " " + tags[i].className + " ";
		if (test.indexOf(tcl) != -1)
			el[j++] = tags[i];
	}
	return el;
}

function openMenu1Item(el){
	var listNiveau2Menu1 = getElementsByClass('niveau2', document.getElementById('menu1'), '*');
	for (i in listNiveau2Menu1){
		listNiveau2Menu1[i].style.display = 'none';
	}


	var listNiveau2 = getElementsByClass('niveau2', el, '*');
	for (i in listNiveau2){
		listNiveau2[i].style.display = 'block';
	}
}
function openMenu2Item(el){
	var listNiveau2Menu1 = getElementsByClass('niveau2', document.getElementById('menu2'), '*');
	for (i in listNiveau2Menu1){
		listNiveau2Menu1[i].style.display = 'none';
	}

	var listNiveau2 = getElementsByClass('niveau2', el, '*');
	for (i in listNiveau2){
		listNiveau2[i].style.display = 'block';
	}
}