Hide/show forms with Javascript

[adam_uk]

hey people

im making a script for work and i h ave to radio buttons

one yes and one no

when they click yes i need a div tag with a textbox to appear to so they can enter text and then when they click no it goes away

i have a working version in ie but not in mozilla

heres my code

<SCRIPT language="JavaScript">
document.all.txtbox.style.display ='none';
</SCRIPT>
<input type='button' value='Yes' class='button'onClick="document.all.txtbox.style.display =''">

<SPAN ID="txtbox" STYLE="position:absoloute; display:none">
YOUR HTML CODE or FIELDS
</SPAN>