Grazie per la risposta. Ho trovato questo.
Ora vorrei integrare gli alert in relazioni ai punteggi delle funzioni if e else presenti nel quiz precedente.
codice:
<html>  	   
<head>  	
<meta http-equiv="Content-Language" content="en-us">  	
<title>Quanto sei bravo?</title>  	
<script type="text/Javascript">  
	var rightAnswer=new Array();  	
var questPerPage=2;  	
var quests=Array("Quest0","Quest1","Quest2","Quest3","Quest4","Quest5","Quest6","Quest7");  	
var answers=Array();  	
answers[0]=Array(1,"answer1","answer2","answer3","answer4")  	
answers[1]=Array(2,"answer5","answer6","answer7","answer8")  	
answers[2]=Array(3,"answer9","answer10","answer11","answer12")  

answers[3]=Array(4,"answer13","answer14","answer15","answer16")  	answers[4]=Array(4,"answer17","answer18","answer19","answer20")  	answers[5]=Array(3,"answer21","answer22","answer23","answer24")  	answers[6]=Array(2,"answer25","answer26","answer27","answer28")  	answers[7]=Array(1,"answer29","answer30","answer31","answer32")  	   	function showQuestion(){  	htmlStr="";  	for(qpp=0;qpp<questPerPage;qpp++){  	   	q=Math.floor(Math.random()*quests.length)  	htmlStr+="Q#"+qpp+": "+quests[q]+"
A: ";  	   	rightAnswer[qpp]=answers[q][0]-1;  	   	for(a=1;a<answers[q].length;a++){  	htmlStr+="<input name='ansr"+qpp+"' type='radio' value=''><label>"+answers[q][a]+"</label>  "  	}  	htmlStr+="

";  	}  	document.getElementById("myQuiz").innerHTML=htmlStr  	}  	   	function Nextlevel(){  	for (ra=0;ra<rightAnswer.length;ra++){  	radios=document.getElementsByName("ansr"+ra)  	if (radios[rightAnswer[ra]].checked){  	alert("The Answer#"+ra+" is correct");  	}else{  	alert("The Answer#"+ra+" is incorrect");  	}  	}  	showQuestion()  	}  	</script>  	</head>  	   	<body>  	   	<h1>Quiz:</h1>  	<form id="myQuiz" action="">  	   	   	</form>  	<form action="">   <input type="button" style="background-color: yellow" onclick="Nextlevel()" name="button1" value="Quiz completato!" />    	<script>  	showQuestion()  	
</script>  	   	
</body>  	   	
</html>