Prevent equal multiple Contact Form 7 submissions using cookies (part 1)

cookies-1.js

var Cookie = {
  Set: function (name, value) {
    var expires = "";
    var date = new Date();
    date.setTime(date.getTime() + (5 * 60 * 1000));
    expires = "; expires=" + date.toGMTString();
    document.cookie = name + "=" + value + expires + "; path=/";
  },
  Get: function (name) {
    var nameEQ = name + "=";
    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, c.length);
      if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
  }
};