diff --git a/xpfe/components/bookmarks/public/nsIBookmarksService.idl b/xpfe/components/bookmarks/public/nsIBookmarksService.idl
index eeea0348db7e..b109d07a6923 100644
--- a/xpfe/components/bookmarks/public/nsIBookmarksService.idl
+++ b/xpfe/components/bookmarks/public/nsIBookmarksService.idl
@@ -31,10 +31,11 @@
 [scriptable, uuid(a82e9300-e4af-11d2-8fdf-0008c70adc7b)]
 interface nsIBookmarksService : nsISupports
 {
-    void ReadBookmarks();
-    void AddBookmark(in string aURI, in wstring aTitle);
-    void UpdateBookmarkLastVisitedDate(in string aURL);
-    string FindShortcut(in wstring aName);
+    void	ReadBookmarks();
+    boolean	IsBookmarked(in string aURI);
+    void	AddBookmark(in string aURI, in wstring aTitle);
+    void	UpdateBookmarkLastVisitedDate(in string aURL);
+    string	FindShortcut(in wstring aName);
 };
 
 %{C++
diff --git a/xpfe/components/bookmarks/src/nsBookmarksService.cpp b/xpfe/components/bookmarks/src/nsBookmarksService.cpp
index 427bf21b1e8e..f6e57e9ed912 100644
--- a/xpfe/components/bookmarks/src/nsBookmarksService.cpp
+++ b/xpfe/components/bookmarks/src/nsBookmarksService.cpp
@@ -2673,6 +2673,27 @@ nsBookmarksService::AddBookmark(const char *aURI, const PRUnichar *aOptionalTitl
 
 
 
+NS_IMETHODIMP
+nsBookmarksService::IsBookmarked(const char *aURI, PRBool *isBookmarkedFlag)
+{
+	if (!aURI)		return(NS_ERROR_UNEXPECTED);
+	if (!isBookmarkedFlag)	return(NS_ERROR_UNEXPECTED);
+	if (!mInner)		return(NS_ERROR_UNEXPECTED);
+
+	*isBookmarkedFlag = PR_FALSE;
+
+	nsresult			rv;
+	nsCOMPtr<nsIRDFResource>	bookmark;
+	if (NS_SUCCEEDED(rv = gRDF->GetResource(aURI, getter_AddRefs(bookmark))))
+	{
+		rv = mInner->HasAssertion(bookmark, kRDF_type, kNC_Bookmark,
+			PR_TRUE, isBookmarkedFlag);
+	}
+	return(rv);
+}
+
+
+
 NS_IMETHODIMP
 nsBookmarksService::UpdateBookmarkLastVisitedDate(const char *aURL)
 {