Using Java Script to set cookies of a JSP form

Hi,
i m new to JSP as well as Javascript. i have a JSP which has two fields which are generated dynamically based on a no. of rows in a datasource, for eg. product datasource and the fields are productId,A. I also have one href link which opens another jsp. I want to set the cookie for productid when the user clicks on the link. i have written a javascript for setting the cookie. but i get a error saying the variable prodid object is null or not an object.The code is something like this,
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ taglib uri="/webapp/DataTags.tld" prefix="jbo" %>
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
function setck(field) {
for (i = 0; i < field.length; i++) {
var pid = field.value;
if ( pid != null && pid.length > 0)
document.cookie = "CookieProductId" + i + "=" + pid;
</script>
</HEAD>
<BODY>
<center>
<form name=myform >
<jbo:ApplicationModule id="am" configname="FleetCardsBC.FleetCardsBCModule.FleetCardsBCModuleLocal" releasemode="Stateful" />
<jbo:DataSource id="dsProd" appid="am" viewobject="FmmProductsView"/>
<jbo:DataSource id="dsProdRes" appid="am" viewobject="FmmProductRestrictionsView"/>
<table>
<%int nRow = 0;%>
<%
nRow++;
String s1 = null;
Cookie[] cookies = request.getCookies();
if (cookies != null)
for (int i=0; i<cookies.length; i++)
s1 = "name: "+cookies[i].getName()+ " value: "+cookies[i].getValue();
out.println(s1);
%>
<jbo:RowsetIterate datasource="dsProd" >
<tr><td>Product Id </td>
<td><input type=text name="prodid" ></td>
<td>A value </td>
<td><input type=text name="A" ></td>
<td>
<a href="prodresdet.jsp" onfocus="this.value=setck(this.form.prodid)" >More Details</a>
</td>
</tr>
</jbo:RowsetIterate>
</table>
</form>
</center>
</BODY>
</HTML>
Interestingly the cookies get set if instead of a link i use a button. Can someone tell what m i doing wrong, using a link.
Thanks in advance
Unmesh

Doesn't work consistently.
Here is the file modified with your script:
https://www.box.com/s/09dzlu2kmiv7uziqef7j
The way it should work is that, when you enter in a code, such as 1, a type appears on the right hand side- either C or S. A C is an automatic Fail and should appear in the pass/fail box after entering in the 1 under the code column. After the Fail appears, the script should be called and the subform should appear.
Then, if you were to change the 1 under the code to a 6, the resulting type is an S which makes the pass/fail box turn to Pass. At this point, the subform should disappear.
Does that make sense?

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