How To Write Radio Button Form With Dynamic Output

I am trying to write a radio button form that has dynamic output. If radio 1 selected then the text would say "one", if radio 2 text = "two", etc. For example:
How many chickens do you own?
Radio 1
Radio 2
*Radio 3
Radio 4

I have the following and am stuck, can I stack getElementsbyid...?
Code:
<script type="text/javascript">
function check() {
document.getElementById('Radio1').firstChild.nodeValue='one';
}
<form>
<input type="radio" value="0" id="r1" name="r1" onclick="check()" />
<input type="radio" ???? />
<input type="radio" ???? />
<input type="radio" ???? />
</form>
I own <label for="r1" id="Radio1">blank</label> chickens.