Form that makes browser redirect when accessed by either a regular form submit or an Ajax request - is this possible?

Question

I have a web page with a form. When the user submits the form, I want the server to make the browser redirect to a different page from the form action. Right now, I am doing

Answer 1

Here is another option although you will need to do some cross browser tests:

complete: function(request) {
    if(request.status == 200) {
        var doc = document.open(request.getResponseHeader('Content-Type'));
        doc.write(request.responseText);
        doc.close();
    }
}

Major drawbacks: URL in address bar doesn't change; could mess with back button/history

Although I think @crescentfresh's idea is the way to go