Is the "tz_JS" constant defined correctly? Assuming yes, you should be able to simplify your function as follows:
function named_scripts() {
wp_enqueue_script( 'jquery' );
wp_enqueue_script( 'screen', tz_JS . '/screen.js', array( 'jquery' ) );
wp_enqueue_script( 'bootstrap', tz_JS . '/bootstrap/bootstrap.js', array( 'jquery' ) );
wp_enqueue_style( 'custom-style', get_template_directory_uri() . '/css/custom-style.css', array(), '20120208', 'all' );
}
add_action( 'wp_enqueue_scripts', 'named_scripts' );
wp_enqueue_scriptsis suitable for use in loading front-end scripts ( see Codex ). You do not need to check is_admin(), as admin_enqueue_scriptsthis is the appropriate hook for loading scripts on the administrator side.
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