function setCookie(name, value, expires, path, domain, secure) { 
     document.cookie = 
     name + "=" + escape(value) + 
     ((expires) ? "; expires=" + expires.toGMTString() : "") + 
     ((path) ? "; path=" + path : "") + 
     ((domain) ? "; domain=" + domain : "") + 
     ((secure) ? "; secure" : "");
}  
function getCookie(name) { 
     var arg = name + "="; 
     var alen = arg.length; 
     var clen = document.cookie.length; 
     var i = 0; 
     while (i < clen) { 
          var j = alen + i; 
          if (document.cookie.substring(i, j) == arg) return getCookieVal(j); 
          i = document.cookie.indexOf(" ", i) + 1; 
          if (i == 0) break; 
     } 
     return null; 
} 
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, path, domain) { 
     if (getCookie(name)) { 
          document.cookie = 
          name + "=" + 
          ((path) ? "; path=" + path : "") + 
          ((domain) ? "; domain=" + domain : "") + 
          "; expires=Thu, 01-Jan-70 00:00:01 GMT"; 
     } 
}