var openDisplay;
	if ( navigator.appName.indexOf("Microsoft")!=-1 || navigator.appName.indexOf("Internet Explorer")!=-1 ) openDisplay='block';
	else openDisplay='table-row';

	function menuCollapse (id) {
		var arrow = document.getElementById('arrow'+id);
		var sous = document.getElementById('sub'+id);
		if (sous!=null) {
			if (sous.style.display!=openDisplay) {
				//alert('none');
				sous.style.display=openDisplay;
				arrow.innerHTML='v';
			} else {
				//alert('block');
				sous.style.display='none';
				arrow.innerHTML='>';
			}
		}
	}
	
	function menuArrow (id,action) {
		var arrow = document.getElementById('arrow'+id);
		var sous = document.getElementById('sub'+id);
		if (action=='double') {
			if (sous.style.display!=openDisplay) {
				arrow.innerHTML='»';
			} else {
				arrow.innerHTML='«';
			}
		} else {
			if (sous.style.display!=openDisplay) {
				arrow.innerHTML='>';
			} else {
				arrow.innerHTML='v';
			}
		}
	}