Capture Marketo name values in alternate field in addition to primary (for allowing field-level block recordings.)

forms2-hiddennames.js

    MktoForms2.loadForm("//app-xxx.marketo.com", "###-###-###", 1234, function (form) { 
	var vals = form.vals();
	form.onValidate(function() {
		if mktoPreFillFields.FirstName != vals.First || mkto.PreFillFields.LastName != vals.Last {
        form.vals({"alternateFirst":vals.First, "alternateLast":vals.Last});
		};
		});
	});