Javascript radio test

    <html>
    <head><title>OSTAPENKO FAN CLUB</title>
    <style type="text/css">
    #img {
    visibility:hidden;
    }
    #testas {
    visibility:hidden;
    }
    </style>
    <script language="JavaScript">
    function pakeitimas(belekas)
      {
      img.style.visibility="hidden";
      testas.style.visibility="hidden";
      //myElement.style.visibility="hidden";

        var myElement = document.getElementById(belekas);
         myElement.style.visibility="visible";
         if(belekas == "labas") {
            document.getElementById('img').style.visibility="visible";
            document.getElementById('testas').style.visibility="visible";
             alert("TEEES");
        }


            }
            function das(belekas)
      {
        var myElement = document.getElementById('img');
         myElement.style.visibility="visible";
         myElement = document.getElementById('testas');
         myElement.style.visibility="visible";

      }
    </script>
    </head>
    <body>
    <form>
   <div id = 'a' align="center"><br>
<input type="radio" onclick= "pakeitimas('img')" name="group1" value="img"> Paveikslelis<br>
<input type="radio" onclick= "pakeitimas('testas')" name="group1" value="test"> Testas<br>
<input type="radio" onclick= "das('labas')" name="group1" value="test+img"> Testas ir Paveikslelis
    </form>

    <div id = 'img'>
    <img src="http://profile.ak.fbcdn.net/hprofile-ak-snc4/161918_114248675280440_6140163_q.jpg" />
    </div>

    <div id = 'testas'>
    <form>
   <div id = 'a' align="center"><br>
<input type="radio" name="group1" value="img"> ATS1<br>
<input type="radio" name="group1" value="test"> ATS1<br>
<input type="radio" name="group1" value="test+img"> ATS1
    </form>
    </div>
    </body>
    </html>