add_theme_support( 'post-thumbnails');
set_post_thumbnail_size( 250, 125, true );
add_image_size( 'single-post-thumbnail', 250, 125 );
add_theme_support( 'post-thumbnails');
set_post_thumbnail_size( 250, 125, true );
add_image_size( 'single-post-thumbnail', 250, 125 );