how to Include javascript??????

Okay , I am confused, ther are so many methods and I can’t seem to find a right explanation ..

In functions.php I have the following..

wp_register_script( 'info-caroufredsel', get_template_directory_uri() . '/js/jquery.carouFredSel-5.5.0-packed.js', array('jquery'), '5.5.0', true );
  wp_register_script( 'info-carousel-instance', get_template_directory_uri() . '/js/info-carousel-instance.js', array('info-caroufredsel'), '1.0', true );

  wp_register_script( 'jquery.flexslider', get_template_directory_uri().'/js/jquery.flexslider-min.js', array('jquery'), '1.7', true );
  wp_register_script( 'home-page-main-flex-slider', get_template_directory_uri().'/js/home-page-main-flex-slider.js', array('jquery.flexslider'), '1.0', true );

  wp_enqueue_script( 'info-carousel-instance' );
    wp_enqueue_script('home-page-main-flex-slider');

So two scripts are getting enqueued and two are not.

the question is

How do I call the two scripts that are not getting engueued in my theme?

I don’t want the scripts always loading on every page if they arent’ being used? you know what i mean?

I’ve seen so many techniques for javascript It is confusing … there doesn’t seem to be a standard way to do it

I’ve seen people add it in their headers etc etc.

[Please continue in your existing thread if you have more questions – http://wordpress.org/support/topic/javascript-the-proper-way?replies=2%5D