Embedded form not displaying on site

Has anybody ran into an issue where, after editing the standard embed code to include an onSuccess push of an event to Google, the form disappears? Below is the updated embed code I was trying to use. I'm not a develop by any means, but it seems to match the syntax I've seen in other discussions in the community. Thanks for looking!

<script src="//app-sj04.marketo.com/js/forms2/js/forms2.min.js"></script>

<formid="mktoForm_XXX"></form>

<script>

MktoForms2.loadForm(("//app-sj04.marketo.com", "XXX-XXX-XXX", XXXX, function(form){

  form.onSuccess(values, followUpURL){

    dataLayer.push({event: 'EVENT NAME'});

  return true;

  });

});

</script>