I had the code in the popup, but you made another great point that WORKS!! I was not opening the popup with javascript, only with a normal href with a target of _blank...
Thanks!!!
For others, final code:
---Originating page---
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language="JavaScript">
<!--
function OpenWin(URL,Name,features) {
window.open(URL,Name,features);
}
//-->
</script>
</head>
<body bgcolor="#FFFFFF" text="#000000">
<form name="myform">
<p>
<input type="text" name="T1" size="20" value="">
</p>
<p><a href="#" onClick="OpenWin('receive.htm','top','width=210,height=100')">click to open</a></p>
</form>
</body>
</html>
---Receiving page (popup) with radio boxes----
<html>
<body bgcolor="#FFFFFF" text="#000000">
<form>
<p>
<input type="radio" name="R1" value="V1" onClick="opener.document.myform.T1.value=this.value">
<input type="radio" name="R1" value="V2" onClick="opener.document.myform.T1.value=this.value">
</p>
</form>
</body>
</html>