Passing Dynamic Loop Data From Child Page To Parent

Hi All,
     I'm trying to create something where when a user clicks a link on the main page, javascript opens a new window which querys a database and displays the results. The user then selects the result they want via a form button or url (doesn't matter which) from the child page, which sends a value to fill in a form field on the parent page. Sounds simple, but I can't figure out how to get the information back to the parent page from the dynamic form in the child. I get a value of Undefined in the form field on the parent page. I think its because I'm using the same name for each button with a different value, and javascript doesn't like that. I'm not really that good with JS, which I suspect is why I can't get it. I'll post my code below, and any help is greatly appreciated. Thank you!
Parent Page:
<cfform name="RRForm" action="Blah.cfm" method="POST">
<table>
    <tr>
        <th align="right">Start Date:</th>
        <td><cfinput type="text" name="StartDate" value="#sdate#" validate="date" message="Please enter a valid START DATE" maxlength="10" size="10"></td>
    </tr>
    <tr>
        <td><br></td>
    </tr>
    <tr>
        <th align="right">End Date:</th>
        <td><cfinput type="text" name="EndDate" value="#edate#" validate="date" message="Please enter a valid END DATE" maxlength="10" size="10"></td>
    </tr>
    <tr>
        <td><br></td>
    </tr>
    <tr>
        <th align="right">Client Number(s):</th>
        <td><input type="text" name="clientnums" size="20" maxlength="60" value=""> <font style="font-size:8pt">(Comma Separated)</font>   <a href="javascript:void(0);" OnClick="window.open('http://192.168.0.189/BlahList.cfm','ClientList','toolbar=0,menubar=0,resizable=0,location= 0,status=0,scrollbars=1,height=300,width=500')">Client List</a></td>
    </tr>
    <tr>
        <td><br></td>
    </tr>
    <tr>
        <th align="right" valign="top">Precision Level:</th>
        <td><cfinput type="Radio" name="PrecisionLevel" value="Y" checked="No">Years<br><cfinput type="Radio" name="PrecisionLevel" value="M" checked="Yes">Months<br><cfinput type="Radio" name="PrecisionLevel" value="W" checked="No">Weeks<br><cfinput type="Radio" name="PrecisionLevel" value="D" checked="No">Days</td>
    </tr>
    <tr>
        <td><br></td>
    </tr>
    <tr>
        <th align="right">Display Zero:</th>
        <td><cfinput type="Checkbox" name="DisplayZero" value="1" checked="Yes"></td>
    </tr>
</table>
<br>
<br>
<input type="submit" name="RunReport" value="Run Report">
</cfform>
Child Page:
<cfquery name="GetClients" datasource="BlahOLE">
    SELECT clientno,name,inactive
    FROM clients
    ORDER BY #sortcrit# ASC
</cfquery>
<html>
<head>
    <script type="text/javascript">
      function SendInfo(){
        opener.document.RRForm.clientnums.value = document.CForm.PassData.value;
        window.close();
    </script>
    <title>Client List</title>
    <style>
    td{font-size:10pt;}
    </style>
</head>
<body bgcolor="black" text="white" link="aqua" alink="red" vlink="aqua">
<cfoutput>
<form name="CForm" method="post">
<table>
    <tr>
        <th><a href="http://192.168.0.189/BlahList.cfm?sortby=CNO">Client ##<hr></a></th>
        <th>   </th>
        <th><a href="http://192.168.0.189/BlahList.cfm?sortby=CNAME">Client Name<hr></a></th>
        <th>   </th>
        <th>Status<hr></th>
    </tr>
    <cfloop query="GetClients">
    <cfset cno=Trim(ClientNo)>
    <tr>
        <td><input type="Button" name="PassData" value="#cno#" style="width:50" onclick="SendInfo()"></td>
        <td></td>
        <td>#name#</td>
        <td></td>
        <td><cfif inactive is "FALSE"><font color="##33ff33">ACTIVE</font><cfelse><font colore="Silver">INACTIVE</font></cfif></td>
    </tr>
    <tr>
        <td colspan="5"><hr></td>
    </tr>
    </cfloop>
</table>
</form>
</cfoutput>
</body>
</html>

Dan, that was exactly it. Thank you so much for the help!   I'm displaying the corrected code changes below for future reference by others.
<script type="text/javascript">
      function SendInfo(incomingValue){
      opener.document.RRForm.clientnums.value = incomingValue;
      window.close();
</script>
AND
<input type="Button" name="PassData" value="#cno#" style="width:50" onclick="SendInfo(#cno#)">

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