Wordpress: Function - enqueue_scripts_method()

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/* ENQEUE CUSTOM SCRIPTS */
function enqueue_scripts_method() {
        /*
        wp_enqueue_script( $handle, $src, $deps, $ver, $in_footer );

        $handle (required):             script name - Default: None
        $src (optional):                   url to script (optional if wp_register_script has been used, if this is the case use just $handle) - Default: false
        $deps (optional):                if script depends on another script, i.e. 'jquery'  - Default: array()
        $ver (optional):                  script version  - Default: false
        $in_footer (optional):          Boolean to link file in wp_footer().  Default: false
        */


        wp_deregister_script( 'jquery' );
        wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js');
        wp_enqueue_script( 'jquery' );

        wp_register_script('modernizr', get_template_directory_uri() . '/js/libs/modernizr.min.js');
        wp_enqueue_script ('modernizr');

        wp_enqueue_script('respond.js', get_template_directory_uri() . '/js/libs/respond.min.js', array('jquery'), '1.0', true);
        wp_enqueue_script('custom_script', get_template_directory_uri() . '/js/script.js', array('jquery'), '1.0', true);

                // Load Mobilizr if the user is on a mobile device.
        $agent = $_SERVER['HTTP_USER_AGENT'];

        if(preg_match('/iPhone|Android|Blackberry/i', $agent)){
            wp_enqueue_script('mobilizr', get_template_directory_uri() . '/js/mobilizr.js', array('jquery'), '1.0', true);

        }

}

add_action('wp_enqueue_scripts', 'enqueue_scripts_method');