Mega Code Archive
Button set Textfield value
<![CDATA[
<html>
<body>
<form name="quiz">
<input type="text" value="" name="sky">
<input type="hidden" value="blue" name="blue">
<input type="button" value="See Answer" onClick="document.quiz.sky.value=(document.quiz.blue.value)">
</form>
</body>
</html>
]]>