Image refresh (javascript) 

<IMG src="streams.png" name="refresh">
      <SCRIPT language="JavaScript" type="text/javascript">
      <!--
      var t = 30 // interval in seconds
      image = "streams.png" //name of the image
      function Start() {
      tmp = new Date();
      tmp = "?"+tmp.getTime()
      document.images["refresh"].src = image+tmp
      setTimeout("Start()", t*1000)
      }
      Start();
      // -->
      </SCRIPT>