Here's a very simple example of using OAuth via XMLHttpRequest. Each of these buttons will request OAuth tokens, and display the resulting HTTP responses in popup windows.

This won't work if you load this page from an HTTP server, because it attempts to send requests via XMLHttpRequest to term.ie or madgex.com. Most browsers forbid this for security reasons. You can make it work with Microsoft Internet Explorer, if you copy this page to a file and direct your browser to load from the file.