Following up on my last comment, I put together a very basic script such that when the form is submitted, I just alert the value of the email address.
My Test Landing Page - http://go.kokopop.com/Form2APILP.html and below is the script when you view source.
	<script src="//munchkin.marketo.net/jquery-latest.min.js"></script>
	<script>
	var $jQ = jQuery.noConflict();
	var myForm  = null; //will be set to the form object after the window is loaded
	function printSomeValues()
	{
	var vals = myForm.getValues();
	window.alert("Here is the email address - " + vals.Email);
myForm.submitable(true);
	}
	$jQ(window).load(function() {
	console.log("Good news ... window is loaded");
	if (MktoForms2.getForm(1944))
	{
	myForm = MktoForms2.getForm(1944);
	myForm.onSubmit(function(){
printSomeValues();
	}); 
	}
	});
	</script>