Radio buttons circle image dont appear

Radio buttons circle image dont appear

Hi All,
   I'm using the example code for radio buttons on my app, with Phonegap. The vertical list of options is builded ok, but the circular image on each non checked option  is not showed, only on checked option.
   Any suggestion ?

Here is my code ( head and html tags was removed ):

<script type="text/javascript" charset="utf-8" src="cordova-1.9.0.js"></script>
    <link rel="stylesheet" href="jquery.mobile-1.1.1.min.css" />
    <script src="jquery-1.7.2.min.js"></script>
    <script src="jquery.mobile-1.1.1.min.js"></script>
 <script type="text/javascript">
                       
           // PhoneGap is loaded and it is now safe to make calls PhoneGap methods
           function onDeviceReady() {
                navigator.network.isReachable('phonegap.com', reachableCallback);
               
            }
                                      
    </script> 

<body>
       
        <div data-role="page" id="home" data-theme="b">
            <div data-role="header" data-position="fixed">
                <h1>Mobile Test</h1>
            </div>
           
            <div data-role="fieldcontain" >
                <fieldset data-role="controlgroup" >
                    <legend>Choose a pet:</legend>
                    <input type="radio" name="radio-choice-1" id="radio-choice-1" value="choice-1" checked="checked"  />
                    <label for="radio-choice-1">Cat</label>
                   
                    <input type="radio" name="radio-choice-1" id="radio-choice-2" value="choice-2"  />
                    <label for="radio-choice-2">Dog</label>
                   
                    <input type="radio" name="radio-choice-1" id="radio-choice-3" value="choice-3"  />
                    <label for="radio-choice-3">Hamster</label>
                   
                    <input type="radio" name="radio-choice-1" id="radio-choice-4" value="choice-4"  />
                    <label for="radio-choice-4">Lizard</label>
                </fieldset>
            </div>
           
        </div>
       
    </body>