Here you can use Identifier (id) to each input element. Like as below:-
<form>
<lable>First Name
<input type="text" name="firstName" id="formSUbmitFirstName" />
<label>Last Name</label>
<input> type="text" name="lastName" id="formSubmitLastName"/>
....
</input></lable></form>
And while retreiving values, write
var firstNameForPost = $("#id").val();