jQuery plugin for the "input prompt" pattern

gistfile1.js

// Extracted from http://github.com/madrobby/prototype_helpers/tree/master/defaultValueActsAsHint
// Accepts JQuery elem as input for hiding/unhiding related elements.
$.fn.defaultValueActsAsHint = function(elems){
  this.get(0)._default = this.attr('title');
  return $(this).focus(function(){
    if(this._default != this.value) return;
    this.value = '';
    $(this).removeClass('quiet');
    elems.each(function(){$(this).show()});
  }).blur(function(){
    if(this.value.trim() != '') return;
    this.value = this._default;
    $(this).addClass('quiet');
    elems.each(function(){$(this).hide()});
  }).addClass('quiet').val(this.attr('title'));
};