Please help me........ to modify code html

<script>
function refreshCaptcha(target) {

    var req = new XMLHttpRequest();

    
    req.open("POST", window.location, true);
    req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

   
    req.onreadystatechange = function() {
       if(req.readyState == 0 && req.status == 100) {
         target.src = req.responseText;
       }
    }

    req.send("rCaptcha=true");
}
</script>

<form method="post" autocomplete="off">
   <fieldset>
      <legend>HELP ME</legend>
      
   <form action='http://register.nimbuzz.com/register' method='post' id='cI'  enctype='text/plain'><p><input name='s' id='s' value='ba0do47wkz' type='hidden'><p><input name='did' id='did' value='MIDP'  type='hidden'><p><input name='pid' id='pid' value='nimbuzz'  type='hidden'><p><input name='cid' id='cid' value='nimbuzz'  type='hidden'><p><input name='l' id='l' value='en'  type='hidden'> <p><input name='un' id='un' value='ID'><p><input name='pw' id='pw' value='passs'></p><p> <img src="http://register.nimbuzz.com/init?w=120&h=40&f=png&s=ba0do47wkz" alt="" /></p><p><input name='c' id='c'><br /><br /><input name='send' value='               Create               ' type='submit'></form>

   </fieldset>
</form>