I am using the below cookie javascript to run a background color changer on my site.  I want to also use it for the background color of my forum which is in a separate folder (http://lightbulbchoice.com/forum).  I currently have it working on both the site and forum but you have to set each separately, i.e., each is setting it's own cookie.
How do I get the forum to locate the main site cookie and not set it's own?
  
      //  Cookie Functions - Second Helping  (21-Jan-96)
      //  Written by:  Bill Dortch, hIdaho Design 
      //  The following functions were released to the public domain by him.
      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" : "");
} // --> </script>