I have searched everywhere and cannot seem to find a method of creating a custom JavaScript form save button
It appears that the class to do it is missing from Nintex 2010 ?
What I am trying to do is create a button that will submit the list item, and then open NewForm.aspx and also have another button on the form for a "regular save" that redirects the user to a thank you page.
Redirecting to the thank you page is the easy part, just use the advanced properties and paste in your url.
Submitting a form using JavaScript seems to be the hurdle for the first button.