bit.ly url shorten function using jQuery

var shortenUrl = function(longUrl) {
  var apiLogin = 'yourapilogin',
      apiKey = 'yourApiKey';
  // call the bit.ly service
  $.getJSON('http://api.bit.ly/shorten?callback=?', {
     long_url: mediaUrl,
     version: '2.0.1',
     login: apiLogin,
     api_key: apiKey,
     format: 'json',
     history: 1
   }, function(data){
     try{
       var shortUrl = data.results[mediaUrl].shortUrl;
       if(shortUrl && shortUrl !== 'undefined'){
         // do here something with the shortened url
       }
     }catch(msg){
       // bit.ly failed, try something else
     }
   });  
};
// example
shortenUrl('http://tracksonamap.com/#city-8457');