Access theme options in templates

The bt_theme_opts_page() function handles your theme’s options, and in that function there is this line:

$theme_opts = get_option('bt_opts');

So your theme’s options are being stored in bt_opts. To retrieve it, use the same code in your page.php file. So you would need:

$theme_opts = get_option('bt_opts');
echo $theme_opts['content_width'].' sidebar will be '.(12 - $theme_opts['content_width']);