biraz işsizlik yapmış olabilirim ))
işinizi görür sanırım.

Çalışan Örnek : http://www.lletech.com/deger-degisim/

index.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="robots" content="noindex">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>DEGER DEGISIM</title>
<link href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<link href='https://fonts.googleapis.com/css?family=Open+Sans:300,700' rel='stylesheet' type='text/css'>
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
<h2>Deger Degisim Tablosu</h2>
<p><input type="button" onclick="SetDegerAlTimer()" value="başlat"/><input type="button" onclick="StopDegerAlTimer()" value="durdur"/></p>
<p>Değişim Hızı : <select id="hiz"><?for($i=1; $i<31; $i++){print"<option value='$i'>$i saniye</option>";}?></select></p>
<table class="table table-bordered">
<thead>
<tr>
<th style="width:50%;">Tür</th>
<th style="width:50%;">Sonuç</th>
</tr>
</thead>
<tbody>
<tr>
<td>Önceki Değer</td>
<td id="onceki-deger">0</td>
</tr>
<tr>
<td>Yeni Değer</td>
<td id="yeni-deger">0</td>
</tr>
<tr>
<td>Değer Değimi</td>
<td id="degisim">0</td>
</tr>
</tbody>
<tfoot>
<tr>
<th id="durum" colspan="2" style="text-align:center; font-size:12px;">...</th>
</tr>
</thead>
</table>
</div>

<script>
var onceki_deger, yeni_deger, timer;
var hiz = 1;

DegerAl();
SetDegerAlTimer();

function DegerAl(){
$.ajax({
type : "POST",
url : "service.php",
beforeSend : function(){ onceki_deger = $("#yeni-deger").html(); },
success : function(yeni_deger){
$("#onceki-deger").html(onceki_deger);
$("#yeni-deger").html(yeni_deger);

Degisim(onceki_deger, yeni_deger);
}
});
}

function Degisim(onceki_deger, yeni_deger){
var result = "";
if(onceki_deger > yeni_deger){
result = "<font color=red>Deger Azaldı</font>";
}else if(onceki_deger == yeni_deger){
result = "<font color=blue>Deger Aynı</font>";
}else{
result = "<font color=green>Deger Arttı</font>";
}

$("#degisim").html(result);
}

function SetDegerAlTimer(){
clearInterval(timer);
timer = setInterval(function(){ DegerAl(); }, (hiz * 1000));
SetDurum("started");
}

function StopDegerAlTimer(){
clearInterval(timer);
SetDurum("stopped");
}

function SetDurum(tip){
if(tip == "started"){
$("#durum").html("<font color=green>Yenileme aktif. Değer <b>"+hiz+"</b> saniyelik peryotlarla yenilecektir.</font>");
}else if(tip == "stopped"){
$("#durum").html("<font color=red>Yenileme devre dışı bırakıldı. Değer yenilenmeyecek.</font>");
}
}

$("#hiz").change(function(){
hiz = $(this).val();
SetDegerAlTimer();
});
</script>

</body>
</html>
service.php
<?
$min = 1;
$max = 10;

$deger = frand($min, $max);
$deger = sprintf("%.2f", $deger);

print $deger;

function frand($min, $max) {
return $min + mt_rand() / mt_getrandmax() * ($max - $min);
}
?>