function expand(li) {
	var node = li.firstChild;
	var img = li.firstChild;
	while ( node.nodeName != "UL" )
		node = node.nextSibling;
	while ( img.nodeName != "IMG" )
		img = img.nextSibling;	
	if ( node.style.display == 'none' ) {
		node.style.display = 'block';
		img.src = '/includes/reactions/img/minus.gif';
		img.alt = '[-]';
	}
	else {
		node.style.display = 'none';
		img.src = '/includes/reactions/img/plus.gif';
		img.alt = '[+]';
	}
}

function expandMultiple(id) {
	a = document.getElementById(id);
	var ul = a;
	while ( ul.nodeName != "UL" ) {
		ul = ul.nextSibling;
	}
	while(ul.nodeName=="UL") {
		if(ul.id != 'racine') {
			expand(ul.parentNode);
			ul = ul.parentNode.parentNode;
		}
	}
}

function collapseMultiple() {
	niv1 = document.getElementById('niv1');
	tab_ul = niv1.getElementsByTagName("UL");
	nb = tab_ul.length;
	for(var i=0; i<nb; i++) {
		expand(tab_ul[i].parentNode);
	}
}

function initArbo(menu, smenu) {
	collapseMultiple();
	if(document.getElementById(smenu)) {
		expandMultiple(smenu);
	}
	else {
		if(document.getElementById(menu)) {
			expandMultiple(menu);
		}
	}
}