I need a Twitter widget which I can embed into pages of my site, it needs to be able to search for a hashtag and some keywords, and automatically update and display the live results (using AJAX, not simply refreshing the page).



Users will also need to be able to post tweets from the widget, logging in via the API, and a hashtag of the search should automatically be entered at the start of the text field. A 140 character limit needs to be in place too, with a character counter.



If you take a look at http://www.tweetizen.com/ it'll give you a basic and idea of what I need done. You'll need to be familiar with the Twitter API and AJAX.
This is a quick visual mockup (based on Tweetizen) of what I need: