jquery-mixin-example.js

// This is a mixin that will be applied to a `fieldset.row`.
// `this` in these functions will refer to a $("fieldset.row").
// Put your long complicated functions here
var Row = {
  $name: function() {
    return this.find('input[name=name]');
  },

  changeName: function(value) {
    this.$name().val(value);
  },

  disable: function() {
    this.find('select, input').attr('disabled', 1);
    this.find('span').html("(disabled)");
  }
};

// Now they can be accessed like so...
$row = $("fieldset.row").extend(Row);
$row.changeName("Jason");
$row.disable();