jQuery Multiple forms validation

I'm using a jQuery forms validation code I found online to validate 2 different forms on the same page.  1 form is a registration form, the other is a login form, in case they've already registered.

When the forms are submitted, if they pass validation, they go to this function:

$.validator.setDefaults({
	submitHandler: function() { 
		
			alert("submitted!");	
	}
});

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The trick is, I want to run ajax to process the results, so I need to know what form was submitted, but I'm not sure how to do that.

The first form's id is "registerForm"  and the second form's id is "loginForm"

The validation looks like this:

$("#loginForm").validate({
		rules: {
			email: {
				required: true,
				email: true
			}
		},
		messages: {
			email: "Please enter a valid email address"
		}
		
	});

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The registration form's validation is similar, with more fields.  

If I submit either form, and they pass the validation, I get the "submitted!" alert.

Any ideas on how I tell which one was submitted?