Post thumbnails

WordPress  2.9 and up supports post and page thumbnails. Now you don’t need custom fields or extra plugins. Simply open your functions.php and add

add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 50, 50, true );

50, 50 means width and height accordingly. Then insert the following code in any loop you want to display the thumbnail
<?php the_post_thumbnail(); ?>

More detailed discussion here

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