How to access radioButton individual items?
<p>I've got 2 radio button groups showed differently depending on the value selected on another radio button. The thing is that I would like to set the default value of the group to the first element in the radiobutton group, but when I change from the other radio button it preserves the value previously selected, when I want it to be reset to the default value. </p>

<p>I've been searching in the javascript repository but apparently I cannot access like it says with <code>radio[1].checked = true</code>... It says that <code>radio[1]</code> is undefined, but radio is an HTML Input element object. I'm accessing it from a different file, but <code>var radio = document.getElementById("radio")</code> works, but I can't access the individual radiobuttons.</p>

<p>Thank you in advance</p>
