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 = (2 < argc) ? argv[2] : null;
   var path = (3 < argc) ? argv[3] : null;
   var domain = (4 < argc) ? argv[4] : null;
   var secure = (5 < argc) ? argv[5] : false;
 
   document.cookie = name + "=" + escape (value) + ((expires == null) ? "" :
     ("; expires=" + expires.toGMTString())) + ((path == null) ? "" :
     ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) +
     ((secure == true) ? "; secure" : "");
  }