Index: src/wp-admin/js/media.js
===================================================================
--- src/wp-admin/js/media.js	(revision 29094)
+++ src/wp-admin/js/media.js	(working copy)
@@ -92,9 +92,17 @@
 		$( '#find-posts-close' ).click( findPosts.close );
 		$( '#doaction, #doaction2' ).click( function( event ) {
 			$( 'select[name^="action"]' ).each( function() {
-				if ( $(this).val() === 'attach' ) {
-					event.preventDefault();
-					findPosts.open();
+				switch( $(this).val() ) {
+					case 'attach':
+						event.preventDefault();
+						findPosts.open();
+						break;
+					case 'delete':
+						event.preventDefault();
+						if ( confirm( 'Delete?' ) ) {
+							$( '#posts-filter' ).submit();
+						}
+						break;
 				}
 			});
 		});