function reTweet(titre, url) {
	BitlyCB.myShortenCallback = function(data) {
		// this is how to get a result of shortening a single url
		var result;
		for ( var r in data.results) {
			result = data.results[r];
			result['longUrl'] = r;
			break;
		}
		var bitly = result['shortUrl'];
		var twitty = 'http://twitter.com/home?status=' + titre + ' (RT @usinenouvelle) - ' + bitly;
		document.location = twitty;
	}
	BitlyClient.shorten(url, 'BitlyCB.myShortenCallback');
}