Jquery and mysql (refresh)

Jquery and mysql (refresh)

Hi guys,
i would like to check every 5 seconds whether a change in my database has been or not.

Now i have the following code:

  1. <html>
    <head>
        <script src="http://code.jquery.com/jquery-latest.js"></script>
        <script type="text/javascript" src="jquery.fade.js"></script>
        <script>
         $(document).ready(function() {
              $("#mydiv").load("index1.php").css("background-color","white");
           var refreshId = setInterval(function() {
              $("#mydiv").load('index1.php').vkfade('ff0000','600');
           }, 5000);
        });
        </script>
    </head>
    <body>
        <div id="mydiv"></div>
    </body>
    </html>















Every 5 seconds index1.php is called and .vkfade will make a red background-color for 600ms:       
var refreshId = setInterval(function() { $("#mydiv").load('index1.php').vkfade('ff0000','600'); }, 5000);


The problem is, I would only like to make the background-fade if a change in my database has happened. Now I see the fade even if nothing changed.

Thanks in advance
John