diff --git a/js/tools.js b/js/tools.js
index 305b87941..30ae1dfed 100644
--- a/js/tools.js
+++ b/js/tools.js
@@ -175,7 +175,7 @@ function addBookmark(url, title)
 {
 	if (window.sidebar)
 		return window.sidebar.addPanel(title, url, "");
-	else if ( window.external )
+	else if ( window.external && ('AddFavorite' in window.external))
 		return window.external.AddFavorite( url, title);
 	else if (window.opera && window.print)
 		return true;
@@ -188,7 +188,8 @@ function writeBookmarkLink(url, title, text, img)
 	if (img)
 		insert = writeBookmarkLinkObject(url, title, '<img src="' + img + '" alt="' + escape(text) + '" title="' + escape(text) + '" />') + '&nbsp';
 	insert += writeBookmarkLinkObject(url, title, text);
-	document.write(insert);
+	if (window.sidebar || window.opera && window.print || (window.external && ('AddFavorite' in window.external)))	
+		document.write(insert);
 }
 
 function writeBookmarkLinkObject(url, title, insert)