<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
function git()
{
    var isim = document.getElementById('isim').value;    
    var nere = "yap=kontrol&isim="+isim;
    
     $('#sonuc').html('<img src="http://upload.wikimedia.org/wikipedia/commons/4/49/Linux_Ubuntu_Loader.gif" />');
     $.ajax({
       type: 'POST',
       url: 'niphell.php',
       data: nere,
       success: function(sonuc) {
        $('#sonuc').html(sonuc).show('slow');
       }
      });
      return false;
}
</script>
<?php
if($_POST["yap"]=="kontrol"){
//veritabanından sorgu yaptır
if($_POST["isim"]=="niphell"){echo 'Hoşgeldin sahip';}else{ echo 'sende kimsin?';}
}else{
?>
<input name="isim" id="isim" value="niphell"/><input type="button" onclick="git()" value="kontrol"/><div style="float:right;" id="sonuc"></div>
<?php
}
?>