function getCookie (name) {
     var dcookie = document.cookie;
     var cname = name + "=";
     var clen = dcookie.length;
     var cbegin = 0;
             while (cbegin < clen) {
             var vbegin = cbegin + cname.length;
                     if (dcookie.substring(cbegin, vbegin) == cname) {
                     var vend = dcookie.indexOf (";", vbegin);
                             if (vend == -1) vend = clen;
                     return unescape(dcookie.substring(vbegin, vend));
                     }
             cbegin = dcookie.indexOf(" ", cbegin) + 1;
                     if (cbegin == 0) break;
             }
     return null;
     }

     function setCookie (name, value, expires) {
             if (!expires) {
                 var expdate = new Date();
                 expdate.setDate(31);
                 document.cookie = name + "=" + escape (value) + "; expires=" + expdate.toGMTString() + "; path=/";
             } else {
                 document.cookie = name + "=" + escape (value) +
                 "; expires=" + expires.toGMTString() +  "; path=/";
             }
     }