helpful-jquery-functions.js

(function($) {
  $.fn.extend({
    equals: function(match) {
      if (!match || !match.length || this.length != match.length)
        return false;
      for (var idx = 0, len = match.length; idx < len; idx++) {
        if (this[idx] != match[idx])
          return false;
      }
      return true;
    },
    contains: function(element) {
      return $(this).children().index(element) != -1;
    }
  });
})(jQuery);