title: How to refresh div every 30 seconds?
body: <p>I have a script which displays a cookie value throw document.write. </p>
  
  <p>How can I refresh the script- update it every 30 seconds? </p>
  
  <p>Or, if it's imposible, to get cookie value again.
          value = GetCookie('VisitorName');</p>
  
  <p>or, put it in iframe and reload the iframe scr.</p>
  
  <p>Code is below:</p>
  
  <pre><code>    var expDays = 30;
      var exp = new Date();
      exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
  
      function Who(info) {
          var VisitorName = GetCookie('VisitorName')
  
          if (VisitorName == null) {
              VisitorName = "Dear visitor";
              SetCookie ('VisitorName', VisitorName, exp);
         }
  
          return VisitorName;
      }
  
      function set() { 
          VisitorName = prompt("");
          SetCookie ('VisitorName', VisitorName, exp);
      }
  
      function getCookieVal (offset) {
          var endstr = document.cookie.indexOf (";", offset);
  
          if (endstr == -1)
              endstr = document.cookie.length;
  
         return unescape(document.cookie.substring(offset, endstr));
      }
  
      function GetCookie (name) {
          var arg = name + "=";
          var alen = arg.length;
          var clen = document.cookie.length;
          var i = 0;
  
          while (i &lt; clen) {
              var j = i + alen;
              if (document.cookie.substring(i, j) == arg)
          return getCookieVal (j);
              i = document.cookie.indexOf(" ", i) + 1;
              if (i == 0)
                   break;
          }   
  
          return null;
     }
  
      function SetCookie (name, value) {
          var argv = SetCookie.arguments;
          var argc = SetCookie.arguments.length;
          var expires = (argc&gt;2) ? argv[2] : null;
          var path = (argc &gt;3) ? argv[3] : null;
          var domain = (argc &gt;4) ? argv[4] : null;
          var secure = (argc &gt;5) ? argv[5] : false;
          document.cookie = name + "=" + escape (value) +
              ((expires == null) ? "" : (";expires=" + expires.toGMTString())) +
              ((path == null) ? "" : (";path=" + path)) +
              ((domain == null) ? "" : (";domain=" + domain)) +
              ((secure == true) ? ";secure" : "");
      }
  
      function DeleteCookie (name) {
          var exp = new Date();
          exp.setTime (exp.getTime() - 1);
  
          var cval = GetCookie (name);
          document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
      }
  
      document.write("" + Who() + ",")
  </code></pre>