How to call external url in jquery?

I am trying to put comments on Facebook wall using jquery.

But my ajax call not alowing external url .

can anyone explain how can we use external url with jquery ?

below is my code :

var fbUrl="https://graph.facebook.com/16453004404_481759124404/comments?access_token=my_token";$.ajax({            url: fbURL ,    data: "message="+commentdata,    type: 'POST',    success: function (resp) {        alert(resp);    },    error: function(e){        alert('Error: '+e);    }  });

its giving xmlhtttprequest error.