How I get get the value of a selected radio button from another frame?

If it is to be compatible with Internet Explorer 3, you will need to access the radios as simple elements:

<form name="myForm"> <input type="text"> <input type="text"> <input type="radio" name="rad" value="1">1 <input type="radio" name="rad" value="2">2 <input type="radio" name="rad" value="3">3 <input type="radio" name="rad" value="4">4 </form>

In the other frame use:

<script language="JavaScript"><!-- theRadioValue = 0; /* we need to start at the third element - element number 2 - javascript counts from 0 */ for (i=2, n=parent.otherframe.document.myForm.elements.length; i<n; i++) {     if (parent.otherframe.document.myForm.elements[i].checked) {         theRadioValue = parent.otherframe.document.myForm.elements[i].value;         break;     } } //--></script>