Radio Button Javascript

I have a form  with a radio button (and of course other fields).

The form statement:

<form method="POST" action="http://www.rain1.com/new-site/authorize_net.php" name="st" onSubmit="return validate_pmnt_form();">

The radio button:

Please note:  Service packages are non refundable and non transferable.&nbsp;&nbsp; <input type="radio" name="ntr" value="y" style="visibility; visible;">&nbsp;&nbsp;  Click to indicate you have read this statement.

The javascript (in function validate_pmnt_form)

if (!document.st.ntr[0].checked) {
      alert("Please click that you understand the non-refundable & non-transferrable statement.");
                        return false;
                  }
If you DO NOT click the radio button, it still submits the form.

What's wrong?

Thanks
Richard KortsBusiness Owner / Chief DeveloperAsked:
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Richard KortsBusiness Owner / Chief DeveloperAuthor Commented:
I changed the javascript to:

if(!document.getElementById('ntr_read').checked) {
                        alert("Please click that you understand the non-refundable & non-transferrable statement.");
                        return false;
                  }      

and gave the radio button an id of ntr_read & it worked.

I'd still like to know why the original did NOT work.

Thanks
COBOLdinosaurCommented:
document.st is not a property of document.
document.forms.st probably words, but the correct reference in modern browsers would be

document.getElementByName('ntr')....

However using the id is more efficient, because of the way the parser organizes the Document Object.

Cd&

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