checkBox selection

Hello Techies,
I am having a form . In this form i am having one add button and one Delete button will come .
when i click on add button 3 combo boxes and one checke box will come.

When i click on delete button what ever the check boxes i had selected they have to be deleted.

I am doing all these stuff in jsp. Here is my code

<INPUT type="button" name="deleteCondBtn" value="Delete"

onClick="checkBoxValidation('<%= RuleSessionManager.RuleRequest.DELETE_CONDITIONS %>')"
/>
&nbsp;&nbsp;
<INPUT
type="button"
name="addCondBtn"
value="Add"
onClick="return sendAddConditionRequest();"
/>

-------
-----------

<INPUT type="checkbox"
name="<%=RuleSessionManager.RuleParameters.DELETE_CONDITION%>"

value="<%=condition.getId()%>" id = 'myOptions'>




I had written code for checkBoxValidation. The function is

function checkBoxValidation(reqType)
{
alert("inside");

if(document.ruleForm.<%=RuleSessionManager.RuleParameters.DELETE_CONDITION%>.checked == false)
{

alert("plz check the condition ");
return false;
}
else
{
alert("inside else()");
doSubmit(reqType);
}
}

This function is working fine for one check box.
When i click on add button one more check box will along with 3 comboboxes.

Now when i click on delete button() I am not going into if condition and getting 500 error.
How can i get plz check the check box??
Can anyone tell me how to do this??

Thankx
Krish