Index: wp-admin/network/themes.php
===================================================================
--- wp-admin/network/themes.php	(revision 20781)
+++ wp-admin/network/themes.php	(working copy)
@@ -179,7 +179,7 @@
 			} // Endif verify-delete
 
 			foreach ( $themes as $theme )
-				$delete_result = delete_theme( $theme, esc_url( add_query_arg( array('verify-delete' => 1), $_SERVER['REQUEST_URI'] ) ) );
+				$delete_result = delete_theme( $theme, esc_url( add_query_arg( array_merge( $_POST, array( 'verify-delete' => 1 ) ), $_SERVER['REQUEST_URI'] ) ) );
 			$paged = ( $_REQUEST['paged'] ) ? $_REQUEST['paged'] : 1;
 			wp_redirect( network_admin_url( "themes.php?deleted=".count( $themes )."&paged=$paged&s=$s" ) );
 			exit;