I'm using the jQuery validation plugin and I want make use of a custom method which takes two the values entered into two different textboxes into account when deciding if the situation is valid.

I know about add method and I've found an example ...

jQuery.validator.addMethod("math", function(value, element, params) { 
 return this.optional(element) || value == params[0] + params[1]; 
}, jQuery.format("Please enter the correct value for {0} + {1}"));

... which references two elements but I'm not clear how to write a rule which would make use of a method such as this ?

To make it easier to discuss imagine that I want to make use of this example method and I've got a form that looks like this ..

<form id="TOTALSFORM" name="TOTALSFORM">
    <label for="LHSOPERAND">Input 1</label>
    <br />
    <input type="text" name="LHSOPERAND" id="LHSOPERAND" class="required" />
    <br />
    <label for="RHSOPERAND">End</label>
    <br />
    <input type="text" name="RHSOPERAND" id="RHSOPERAND" class="required" />
    <label for="TOTAL">End</label>
    <br />
    <input type="text" name="TOTAL" id="TOTAL" class="required" />
</form>

I've got other rules that I apply like this :

$("#OPTREASON").rules("add", {
    required: true,
    min: 0,
    messages: {
        required: "Required input",
        min: "Please select a Reason"
    }
});

How can I do something similar to apply the example custom method shown so that 'TOTAL' is checked as being the sum of 'LHSOPERAND' and 'RHSOPERAND'.

jquery jquery-validate
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