Is it possible to show information from a textfield directly on another place on the same page.

I have a textfield:
HTML Code:
<form action="bla.php" id="formulier" name="formulier"method="post">
<input type="text" name="phone"	style="width:160px" id="phone"/>
</form>
Now when someone types something in this field it has to show it on top of the page, i tried with this, but I can't come any further. What should I do?

HTML Code:
<script>formulier.phone.value</script>