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 < 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 > 2) ? argv[2] : null; 
      var path = (argc > 3) ? argv[3] : null; 
      var domain = (argc > 4) ? argv[4] : null; 
      var secure = (argc > 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);  // This cookie is history 
      var cval = GetCookie (name); 
      document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString(); 
    }