Datepicker : arrow for next month invisible ?

Datepicker : arrow for next month invisible ?

Hi there,
 
I just embeded the datepicker plugin in my html, and for some reason the arrow for the next month is not visible :
 
It looks like this : (see snapshot_issue.png)
 
And it should look like this : (see shapshot_correct.png)
 
Any idea what wrong in my html ?
 
I wrote this :
 
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>New TEST</title>
  <link rel="stylesheet" href="../js/jquery-ui.css">
  <script src="../js/jquery-1.9.1.js"></script>
  <script src="../js/jquery-ui.js"></script>
  <script>  $(function() {    $( "#target" ).datepicker();  });  </script>
</head>








<body>
 <p>Date: <input type="text" id="target"></p>
</body>
</html>