Search results for changing the search phrase doesn't stop tweets for old phrase

[AliAAlkhafaji]

I call the twitter widget but then using ajax, I change the search term (see code below). The problem is that I get the tweets for this new term as well as the old term. How can I make sure it only comes in for the new term.

twitterWidget.stop()
twitterWidget.setSearch(strPhrase);
twitterWidget.render().start();

[niall]