Tips and tricks

Write this in your theme functions.php

[php]if ( is_admin() && isset($_GET['activated'] ) && $pagenow == 'themes.php' ){

 global $wpdb;

    $wpdb->query("UPDATE $wpdb->options

SET option_value='145'

WHERE option_name='thumbnail_size_w'");
    $wpdb->query("UPDATE $wpdb->options

SET option_value='145'

WHERE option_name='thumbnail_size_h'");
}[/php]