// Set cookie
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] : null;

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

// Delete cookie entry
function delCookie(name) {
      var exp = new Date();
      exp.setTime(exp.getTime() - 1);
      var cval = getCookie(name);
      document.cookie = escape(name) + "=" + cval + "; expires=" + exp.toGMTString();
}

// Get cookie by name
function getCookie(name) {
      var arg = escape(name) + "=";
      var nameLen = arg.length;
      var cookieLen = document.cookie.length;
      var i = 0;

      while (i <  cookieLen) {
           var j = i + nameLen;
           if (document.cookie.substring(i, j) == arg)
                return getCookieValueByIndex(j);
           i = document.cookie.indexOf(" ", i) + 1;
           if (i == 0) break;
      }
      return null;
}

// Show the cookie string
function showAllCookie() {
      alert(document.cookie);
}

function getCookieValueByIndex(startIndex) {
      var endIndex = document.cookie.indexOf(";", startIndex);
      if (endIndex == -1)
           endIndex = document.cookie.length;
      return unescape(document.cookie.substring(startIndex, endIndex));
}

// List all name/value pairs in a table
function listCookie() {
      document.writeln("<p><b>原始 Cookie 字串：<p></b><center><font color=green>" + document.cookie + "</font></center>");
      document.writeln("<p><b>拆解後的 name/value：</b>");
      document.writeln("<table border=1 align=center>");
      document.writeln("<tr><th>Name<th>Value");
      cookieArray = document.cookie.split(";");
      for (var i=0; i<cookieArray.length; i++) {
           thisCookie = cookieArray[i].split("=");
           cookieName = unescape(thisCookie[0]);
           cookieValue = unescape(thisCookie[1]);
           document.writeln("<tr><td><font color=red>"+cookieName+"</font><td><font color=green>"+cookieValue+"</font>");
      }
      document.writeln("</table>");
}