//==UserScript==
//@name Add Submit Button
//@namespace http://www.mnemonik.net/
//@description example form adder
//@include *
//==UserScript==

var f = document.getElementsByTagName("form")
var theForm = f[0];
var sub = document.createElement("input");
sub.type = "Submit";
sub.value = "Submit";
sub.name = "Submit";
f.appendChild(sub);