Conditional radio button

Conditional radio button

Hi guys,

Please help. I am totally newbie.

I have one form.
it contains radio buttons

<tr>
<td><input name="ProjExistOPAContract" type="radio" class="radio" id="ProjExistOPAContractYes" value="1" <?php //if (!(strcmp($row_rsEmail['ProjExistOPAContract'],"1"))) {echo "checked=\"checked\"";} ?> /></td>
<td><label for="ProjExistOPAContractYes" class="label100">Yes</label></td>
</tr>

<tr>
<td><input name="ProjExistOPAContract" type="radio" class="radio" id="ProjExistOPAContractNo" value="0" <?php //if (!(strcmp($row_rsEmail['ProjExistOPAContract'],"0"))) {echo "checked=\"checked\"";} ?> /></td>
<td><label for="ProjExistOPAContractNo" class="label100" >No</label></td>
</tr>

I have other fields on the form. so I have jquery already written for onSubmit fields.

####################################

$("#applicationForm").validate({
errorContainer: $("#summary"),
rules: {

ApplicantLegalName: { required: true, minlength: 2 },
ApplicantPrimaryContactFName: { required: true, minlength: 2 },
|
|
| etc
#####################################

I tried this
ProjExistOPAContract: { required: function(element) { return $("input:radio[name='ProjExistOPAContract']:checked").val() == '0'; } },

ProjExistOPAContract is name of radio group. I want if user selects No then it submit otherwise it shows error.

Please help.

Thanks in advance