javscript checkbox values from popup to parent not working:

Hi i have a following code in coldfusion which is driving me crazy:

in my page i have something like this:

<cfform method="post" action="#cgi.SCRIPT_NAME#?#cgi.QUERY_STRING#" name="post_sell_offer" id="post_sell_offer">
<input name="sel_cat" class="tinyborder" type="button" value="Select Category" onclick="WinOpen('category_select.cfm?frm=post_sell_offer&txt=sel_cats','650','540');">
        <input type="button" name="remove_selected" value="Remove Selected" onclick="return removeSelected();" class="button"><br><br />
        <select id="sel_cats" name="sel_cats[]" size="5" multiple style="height: 100px; width: 250px;">
        </select>
</cfform>

Now on clicking category_select.cfm page opens! The code related to category_select.cfm is below!

<script language="javascript1.2">
function checkMaxSelection( chk , rtnForm , rtn )
{
	if (chk.checked )
	{ 
		var theForm = document.frmCats; var z = 0; var sel=0;
		var p = window.opener || parent;
		ddl = p.document.forms[rtnForm].elements[rtn];
		total = ddl.options.length;
		//loop through each element and count the checkbox that are checked
		while (theForm[z])
		{
			if (theForm[z].type == 'checkbox' && theForm[z].checked) { sel++; }
			z++;
		}
		//then see if it is less than the max selection allowed
		if (sel > 3 - total)
		{
			alert('More Categories selected than allowed');
			return false;
		}
	}
	return true;
}

function addSelected( rtnForm , rtn )
{
	var p = window.opener || parent;
	ddl = p.document.forms[rtnForm].elements[rtn];
	total = ddl.options.length;

		if (total >= 3 ) { alert("More Categories selected than allowed"); return false;}
		var theForm = document.frmCats; var z = 0;
	//loop through each element and if its a checkbox and cheked add to the parent's listBox
	while (theForm[z])
	{
		if ( theForm[z].type == 'checkbox' && theForm[z].checked )
		{
			//loop through listbox and add only if not found previously
			found = false;
			for(i=0; i < 3 - total; i++)
				if (ddl.options[i] != null)
					if (ddl.options[i].value == theForm[z].value) found = true;

			if ( !found )
			{
				ddl.options.length++;
				ddl.options[total].text = theForm[z].title;
				ddl.options[total].value = theForm[z].value;
				ddl.options[total].selected = true;
			}
			total = ddl.options.length;
		}
		z++;
	}
	return true;
}
</script>

Now in below we have the following
<cfset getSelectedValues = #tools.getCats(checkpost=val(url.catID))#>
<form method="post" action="mode.cfm?action=selloffer_showkeywordcats&catID=<cfoutput>#val(catID)#</cfoutput>" name="frmCats">
    <input type="hidden" name="txt" value="sel_cats">
	<input type="hidden" name="frm" value="post_sell_offer">
    <table width="100%" border="0" cellspacing="0" cellpadding="0">
      <cfif getSelectedValues.recordcount>
      <cfoutput query="getSelectedValues">
      <tr>
        <td><input type="checkbox" name="chkcat[]" value="#catID#" onClick="return checkMaxSelection(this,'post_sell_offer','sel_cats');">&nbsp;&nbsp;#catName#</td>
      </tr>
      </cfoutput>
      <tr><td>&nbsp;</td></tr>
      <tr><td>
      <input type="submit" value="  Add Selected  " name="done" class="tinyborder">
		<input type="button" value="  Close Window  " onClick="window.close();" name="close" class="tinyborder">
      </td></tr>
      <script language="javascript">
	addSelected('post_sell_offer','sel_cats');
	</script>
    </form>

now my selected category items never get added in the parent Page!

Please guide me what i am doing wrong here!

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