// JavaScript Document
function prima() {
document.getElementById('prima').style.display = "block";
	 document.getElementById('seconda').style.display = "none";
	 document.getElementById('terza').style.display = "none";
	 document.getElementById('quarta').style.display = "none";
	 document.getElementById('li-seconda').className = "current";
	 document.getElementById('li-terza').className = "";
	 document.getElementById('li-quarta').className = "";
}
function seconda() {
document.getElementById('prima').style.display = "none";
	 document.getElementById('seconda').style.display = "block";
	 document.getElementById('terza').style.display = "none";
	 document.getElementById('quarta').style.display = "none";
	 document.getElementById('li-seconda').className = "current";
	 document.getElementById('li-terza').className = "";
	 document.getElementById('li-quarta').className = "";
}     
function terza() {
     document.getElementById('prima').style.display = "none";
	 document.getElementById('seconda').style.display = "none";
	 document.getElementById('terza').style.display = "block";
	 document.getElementById('quarta').style.display = "none";
	 document.getElementById('li-seconda').className = "";
	 document.getElementById('li-terza').className = "current";
	 document.getElementById('li-quarta').className = "";
}   
function quarta() {
     document.getElementById('prima').style.display = "none";
	 document.getElementById('seconda').style.display = "none";
	 document.getElementById('terza').style.display = "none";
	 document.getElementById('quarta').style.display = "block";
	 document.getElementById('li-seconda').className = "";
	 document.getElementById('li-terza').className = "";
	 document.getElementById('li-quarta').className = "current";
}