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,expiresDays)
        {
        var argv = setCookie.arguments;
        var argc = setCookie.arguments.length;
        var path = (argc > 3) ? argv[3] : null;
        var domain = (argc > 4) ? argv[4] : null;
        var secure = (argc > 5) ? argv[5] : false;

        cookieDate = new Date();
        var expires = (expiresDays != null) ? (expiresDays * 1000 * 60 * 60 * 24) : null;

        document.cookie = name + "=" + escape (value) +
        ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
        ((path == null) ? "" : ("; path=" + path)) +
        ((domain == null) ? "" : ("; domain=" + domain)) +
        ((secure == true) ? "; secure" : "");
        }

function getCookieVal (offset)
         {
         var endstr = document.cookie.indexOf (";", offset);
         if (endstr == -1)
         endstr = document.cookie.length;
         return unescape(document.cookie.substring(offset, endstr));
         }

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();
        }