Ændring af value i form

<p>
    Ban <input type="radio" name="banradio" checked="checked" onclick="document.getElementById('begrundelse').style.display='block';document.getElementById('banbutton').value='Ban'">
    Un-Ban <input type="radio" name="banradio" onclick="document.getElementById('begrundelse').style.display='none';document.getElementById('banbutton').value='Un-Ban'">
</p>

<p>
    Bruger:<br>
    <select>...</select>
</p>

<p id="begrundelse">
    Begrundelse:<br>
    <textarea></textarea>
</p>

<input type="button" id="banbutton" value="Ban">
<input type="reset" value="Reset">

Mange tak (:

Og tak for point! :)