I have used this plugin on my website to display tweets, but even the plugin site has the problem:
http://coda.co.za/content/projects/jquery.twitter/
Code:>
If you don't want to use PHP, and just want to use Javascript, then you can use the Javascript library "TweetJS", from www.tweetjs.com
You can retrieve and display tweets using this library, but you cannot post out tweets, since this requires authentication. Here's an example on how to display tweets from a timeline (to the console):
TweetJs.ListTweetsOnUserTimeline("PetrucciMusic",
function (data) {
console.log(data);
});