<script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js"></script>
<script type="text/javascript">
function getir($i){
	$('.'+$i).toggle('fast');
}

</script>

Ahmet <button onclick="getir('ahmet');">getir</button> <div class="ahmet" style="display:none">Ahmetin bilgileri </div><br>
Mehmet <button onclick="getir('mehmet');">getir</button> <div class="mehmet" style="display:none">mehmetin bilgileri </div><br>
Hasan <button onclick="getir('hasan');">getir</button> <div class="hasan" style="display:none">hasanın bilgileri </div><br>