$(document).ready(function() {
	$('#zipcode1').autotab({ target: 'zipcode2', format: 'numeric' });
	$('#zipcode2').autotab({ format: 'alpha', uppercase: 'true', previous: 'zipcode1' });
	
	// Combine fields into 1 parameter
	$('#zipcodeForm').submit(function(){
		$('#postbode').val($('#zipcode1').val() + $('#zipcode2').val());
		$('#zipcode1').remove();				
		$('#zipcode2').remove();
	});
});