$.fn.clean = function() {
        return this.each(function() {
          var type = this.type, tag = this.tagName.toLowerCase();
          alert(type);
          if (tag == 'form')
            return $(':input',this).clean();
          if (type == 'text' || type == 'password' || tag == 'textarea')
            this.value = '';
          else if (type == 'checkbox' || type == 'radio')
            this.checked = false;
          else if (tag == 'select')
            this.selectedIndex = -1;
        });
};