Thanks for the help, I did exactly that, and nothing happens after pressing the
signup button (after all form fields are filled out). I checked the network tab in firebug and no new request is sent, also the JS console shows no error at the moment when the button is pressed. Even tried getting the form element like:
var form = document.getElementById("form"); //strangely the id of the form is form

form.submit(); //throws an error
I say, something is definitely wrong with it.