Stuff

<script type="text/javascript">
<!--
function tar()
{
	 document.lomake.huomio.value="Hello World!";
}
// -->
</script>
<form id="lomake" method="post" onkeypress="tar()" action="lisaa.php">
  <p>
    <input type="text" name="hienokentta"/><br />
    <input type="text" name="huomio"/>
</p>
</form>