Q10 How do I set and access the value of a hidden form field?

<form name="anotherName">
<input type=hidden name="hiddenName" value="initial">
</form>

<script language="JavaScript"><!--
document.write(document.anotherName.hiddenName.value+'<br>');
document.anotherName.hiddenName.value = 'hello world';
document.write(document.anotherName.hiddenName.value+'<br>');
//--></script>