This example uses the onClick handlers in the radio buttons to pass the user's choices to the program. Using the this.value construct simplifies the nomenclature of radio buttons in a document. The button calls the Score() function, which checks the user's answers against an answer key and totals the score. This example has been simplified; the original provided explanations for the correct answers and editorialized on the user's expertise.

Code adapted from this quiz on the JavaScript Source site.

<SCRIPT LANGUAGE="JavaScript">

<!-- 
var ans = new Array;
var yourAns = new Array("", "", "", "", "");

ans[1] = "b";
ans[2] = "a";
ans[3] = "c";
ans[4] = "d";
ans[5] = "b";

function Engine(question, answer) {
yourAns[question]=answer;
}

function Score(){
var score = 0 ;
var answerText = "How did you do?\n===============================";
for(i=1;i<=5;i++){
   answerText=answerText+"\nQuestion "+i+":  ";
  if(ans[i]!=yourAns[i]){
    answerText=answerText+" The correct answer was "+ans[i]+"    \n";
  }
  else{
    answerText=answerText+" Correct! \n";
    score++;
  }
}

answerText=answerText+"===============================\nYour total score is : "+score+"    \n";

alert(answerText);

}
// --> 
</script>

<b>1. The largest living pinniped is....</b><br>
<input type=radio name="q1" value="a" onClick="Engine(1, this.value)">a) the Walrus (<i>Odobenus rosmarus</i>)<br>
<input type=radio name="q1" value="b" onClick="Engine(1, this.value)">b) the Southern Elephant Seal (<i>Mirounga leonina</i>)<br>
<input type=radio name="q1" value="c" onClick="Engine(1, this.value)">c) the Grey Seal (<i>Halichoerus grypus</i>)<br>
<input type=radio name="q1" value="d" onClick="Engine(1, this.value)">d) the Orca (<i>Orcinus orca</i>)<p>

<b>2. The Arctic Bearded Seal (<i>Erignathus barbatus</i>) which has taken up residence in the rivers of Tokyo and Yokohama has been named....</b><br>
<input type=radio name="q2" value="a" onClick="Engine(2, this.value)">a) Tama-chan<br>
<input type=radio name="q2" value="b" onClick="Engine(2, this.value)">b) Tamagotchi<br>
<input type=radio name="q2" value="c" onClick="Engine(2, this.value)">c) Tamago<br>
<input type=radio name="q2" value="d" onClick="Engine(2, this.value)">d) Doraemon<p>

<b>3. Selkies are examples of....</b><br>
<input type=radio name="q3" value="a" onClick="Engine(3, this.value)">a) revenants<br>
<input type=radio name="q3" value="b" onClick="Engine(3, this.value)">b) tricksters<br>
<input type=radio name="q3" value="c" onClick="Engine(3, this.value)">c) shapeshifters<br>
<input type=radio name="q3" value="d" onClick="Engine(3, this.value)">d) talking fish<p>

<b>4. The Caribben Monk Seal (<i>Monachus tropicalis</i>) is....</b><br>
<input type=radio name="q4" value="a" onClick="Engine(4, this.value)">a) common<br>
<input type=radio name="q4" value="b" onClick="Engine(4, this.value)">b) rare<br>
<input type=radio name="q4" value="c" onClick="Engine(4, this.value)">c) highly endangered<br>
<input type=radio name="q4" value="d" onClick="Engine(4, this.value)">d) extinct<p>

<b>5. During the war in Iraq, California Sea Lions (<i>Zalophus californianus</i>) are being used by the US Navy for....</b><br>
<input type=radio name="q5" value="a" onClick="Engine(5, this.value)">a) suicide missions<br>
<input type=radio name="q5" value="b" onClick="Engine(5, this.value)">b) catching enemy frogmen<br>
<input type=radio name="q5" value="c" onClick="Engine(5, this.value)">c) mascots<br>
<input type=radio name="q5" value="d" onClick="Engine(5, this.value)">d) detecting chemical weapons<p>

<input type=button onClick="Score()" value="Test your knowledge!">

</FORM>