cross-domain AJAX/PHP form

** cross-domain AJAX/PHP form *** Looking for an cross-domain AJAX solution to POST 4 fields of an HTML form to a PHP script hosted on an external domain and echo the callback above the HTML form. The external PHP script echoes simple numbers -5 to 2. We need a simple solution if possible with no CGI and not requiring complex server configurations. The solution must be written in simple code easy to understand and be re-utilized/customized. It must bypass all browser security warnings usually involved in cross domain scripting. We need this done quick and well. Let me know if you can do this Job and I will provide the 2 files for your review.