text: function setCookie(cname, cvalue, exdays) {
      var d = new Date();
      d.setTime(d.getTime() +
          (exdays * 24 * 60 * 60 * 1000));
      var expires = "expires=" + d.toUTCString();
      document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
  }
  function getCookie(cname) {
      var name = cname + "=";
      var ca = document.cookie.split(';');
      for (var i = 0; i < ca.length; i++) {
          var c = ca[i];
          while (c.charAt(0) == ' ') {
              c = c.substring(1);
          }
          if (c.indexOf(name) == 0) {
              return c.substring(name.length, c.length);
          }
      }
      return "";
  }
  
  function checkCookie() {
      var username = getCookie("username");
      if (username != "") {
          alert("welcome again + username");
      } else {
          username = prompt("Please enter your Username", "");
          if (username != "" && username != null) {
              setCookie("username", username, 365);
          }
      }
  }