diff --git a/wp-admin/admin-ajax.php b/wp-admin/admin-ajax.php
index b2049e6a04..7564a8b695 100644
--- a/wp-admin/admin-ajax.php
+++ b/wp-admin/admin-ajax.php
@@ -30,14 +30,17 @@ switch ( $action = $_POST['action'] ) :
 case 'delete-comment' :
 	check_ajax_referer( "delete-comment_$id" );
 	if ( !$comment = get_comment( $id ) )
-		die('0');
+		die('1');
 	if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) )
 		die('-1');
 
-	if ( isset($_POST['spam']) && 1 == $_POST['spam'] )
+	if ( isset($_POST['spam']) && 1 == $_POST['spam'] ) {
+		if ( 'spam' == wp_get_comment_status( $comment->comment_ID ) )
+			die('1');
 		$r = wp_set_comment_status( $comment->comment_ID, 'spam' );
-	else
+	} else {
 		$r = wp_delete_comment( $comment->comment_ID );
+	}
 
 	die( $r ? '1' : '0' );
 	break;
@@ -46,24 +49,38 @@ case 'delete-cat' :
 	if ( !current_user_can( 'manage_categories' ) )
 		die('-1');
 
+	$cat = get_category( $id );
+	if ( !$cat || is_wp_error( $cat ) )
+		die('1');
+
 	if ( wp_delete_category( $id ) )
 		die('1');
-	else	die('0');
+	else
+		die('0');
 	break;
 case 'delete-tag' :
 	check_ajax_referer( "delete-tag_$id" );
 	if ( !current_user_can( 'manage_categories' ) )
 		die('-1');
 
+	$tag = get_term( $id, 'post_tag' );
+	if ( !$tag || is_wp_error( $tag ) )
+		die('1');
+
 	if ( wp_delete_term($id, 'post_tag'))
 		die('1');
-	else	die('0');
+	else
+		die('0');
 	break;
 case 'delete-link-cat' :
 	check_ajax_referer( "delete-link-category_$id" );
 	if ( !current_user_can( 'manage_categories' ) )
 		die('-1');
 
+	$cat = get_term( $id, 'link_category' );
+	if ( !$cat || is_wp_error( $cat ) )
+		die('1');
+
 	$cat_name = get_term_field('name', $id, 'link_category');
 
 	// Don't delete the default cats.
@@ -94,14 +111,20 @@ case 'delete-link' :
 	if ( !current_user_can( 'manage_links' ) )
 		die('-1');
 
+	$link = get_bookmark( $id );
+	if ( !$link || is_wp_error( $link ) )
+		die('1');
+
 	if ( wp_delete_link( $id ) )
 		die('1');
-	else	die('0');
+	else
+		die('0');
 	break;
 case 'delete-meta' :
 	check_ajax_referer( "delete-meta_$id" );
 	if ( !$meta = get_post_meta_by_id( $id ) )
-		die('0');
+		die('1');
+
 	if ( !current_user_can( 'edit_post', $meta->post_id ) )
 		die('-1');
 	if ( delete_meta( $meta->meta_id ) )
@@ -113,6 +136,9 @@ case 'delete-post' :
 	if ( !current_user_can( 'delete_post', $id ) )
 		die('-1');
 
+	if ( !get_post( $id ) )
+		die('1');
+
 	if ( wp_delete_post( $id ) )
 		die('1');
 	else
@@ -123,19 +149,28 @@ case 'delete-page' :
 	if ( !current_user_can( 'delete_page', $id ) )
 		die('-1');
 
+	if ( !get_page( $id ) )
+		die('1');
+
 	if ( wp_delete_post( $id ) )
 		die('1');
-	else	die('0');
+	else
+		die('0');
 	break;
 case 'dim-comment' :
 	if ( !$comment = get_comment( $id ) )
 		die('0');
+
 	if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) )
 		die('-1');
 	if ( !current_user_can( 'moderate_comments' ) )
 		die('-1');
 
-	if ( 'unapproved' == wp_get_comment_status($comment->comment_ID) ) {
+	$current = wp_get_comment_status( $comment->comment_ID );
+	if ( $_POST['new'] == $current )
+		die('1');
+
+	if ( 'unapproved' == $current ) {
 		check_ajax_referer( "approve-comment_$id" );
 		if ( wp_set_comment_status( $comment->comment_ID, 'approve' ) )
 			die('1');
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index bde13d03f4..9d7caf5acf 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -768,15 +768,15 @@ function _wp_comment_row( $comment_id, $mode, $comment_status, $checkbox = true
 	$actions = array();
 
 	if ( current_user_can('edit_post', $comment->comment_post_ID) ) {
-		$actions['approve']   = "<a href='$approve_url' class='dim:the-comment-list:comment-$comment->comment_ID:unapproved:e7e7d3:e7e7d3' title='" . __( 'Approve this comment' ) . "'>" . __( 'Approve' ) . '</a> | ';
-		$actions['unapprove'] = "<a href='$unapprove_url' class='dim:the-comment-list:comment-$comment->comment_ID:unapproved:e7e7d3:e7e7d3' title='" . __( 'Unapprove this comment' ) . "'>" . __( 'Unapprove' ) . '</a> | ';
+		$actions['approve']   = "<a href='$approve_url' class='dim:the-comment-list:comment-$comment->comment_ID:unapproved:e7e7d3:e7e7d3:new=approved' title='" . __( 'Approve this comment' ) . "'>" . __( 'Approve' ) . '</a> | ';
+		$actions['unapprove'] = "<a href='$unapprove_url' class='dim:the-comment-list:comment-$comment->comment_ID:unapproved:e7e7d3:e7e7d3:new=unapproved' title='" . __( 'Unapprove this comment' ) . "'>" . __( 'Unapprove' ) . '</a> | ';
 
 		// we're looking at list of only approved or only unapproved comments
 		if ( 'moderated' == $comment_status ) {
-			$actions['approve'] = "<a href='$approve_url' class='delete:the-comment-list:comment-$comment->comment_ID:e7e7d3:action=dim-comment' title='" . __( 'Approve this comment' ) . "'>" . __( 'Approve' ) . '</a> | ';
+			$actions['approve'] = "<a href='$approve_url' class='delete:the-comment-list:comment-$comment->comment_ID:e7e7d3:action=dim-comment&new=approved' title='" . __( 'Approve this comment' ) . "'>" . __( 'Approve' ) . '</a> | ';
 			unset($actions['unapprove']);
 		} elseif ( 'approved' == $comment_status ) {
-			$actions['unapprove'] = "<a href='$unapprove_url' class='delete:the-comment-list:comment-$comment->comment_ID:e7e7d3:action=dim-comment' title='" . __( 'Unapprove this comment' ) . "'>" . __( 'Unapprove' ) . '</a> | ';
+			$actions['unapprove'] = "<a href='$unapprove_url' class='delete:the-comment-list:comment-$comment->comment_ID:e7e7d3:action=dim-comment&new=unapproved' title='" . __( 'Unapprove this comment' ) . "'>" . __( 'Unapprove' ) . '</a> | ';
 			unset($actions['approve']);
 		}