ul {
	list-style-type: none;
	margin: 0;
	padding: 0;
	font: bold 1.5em Georgia, Times, serif;
	margin:50px;
}

nav#principal ul li{
	padding-bottom:20px;
	list-style-image: url(puceorange.gif);  
	padding-left: 20px;
}

nav#principal ul li a{
	text-decoration: none;
	color: #000;
}

nav#principal ul li:hover, 
nav#principal ul li:focus 
	{
	list-style-image: url(puceverte.gif);
	}









