Here's what I do, using Gofreeserve - check my link (on the left) to see it in action:
In File, Preferences:

And this is the script on the webpage, which refreshes every 30 seconds, even though the FTP upload is once  a minute:
<IMG border=5 name=refresh src="RadarBoxScreenShot.gif"></P><P align=center>
  <SCRIPT language=JavaScript type=text/javascript>
      <!--
      var t = 30 // interval in seconds
      image = "RadarBoxScreenShot.gif" //name of the image
      function Start() {
      tmp = new Date();
      tmp = "?"+tmp.getTime()
      document.images["refresh"].src = image+tmp
      setTimeout("Start()", t*1000)
      }
      Start();
      // -->
      </SCRIPT>
Hope that helps
Rod