Something

<HTML>
<HEAD>
<TITLE>Stock List</TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!--

function pick() {
	var list = document.address.list;

  if (window.opener && !window.opener.closed)
     for (i = 0; i < list.length; i++){
		if (list[i].checked == true){
			checked_list += list[i].checked.value;
  		}
		window.opener.document.stockForm.stockBox.value = checked_list;
		window.close();
}


// -->
</SCRIPT>
</HEAD>
<BODY>
<form name="address" action="" method="post">
<input type="checkbox" name="list" value="wootwoot">wootwoot
<input type="checkbox" name="list" value="micheal">micheal 
<input type="submit" name="submit" value="submit" onclick="pick()">
</form>
</BODY>
</HTML>