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diff --git a/ide/extract_index.mll b/ide/extract_index.mll
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(* $Id: extract_index.mll,v 1.2.2.1 2004/07/16 19:30:20 herbelin Exp $ *)
+
+{
+  open Lexing 
+}
+
+(* additional lexer to extract URL from Coq manual's index *)
+
+rule entry = parse
+  | "<LI><TT>" [^ ',']* "</TT>, "
+      { let s = lexeme lexbuf in
+	let n = String.length s in
+	String.sub s 8 (n - 15), extract_index_url lexbuf }
+  | "<LI>" [^ ',']* ", " 
+      { let s = lexeme lexbuf in
+	let n = String.length s in
+	String.sub s 4 (n - 6), extract_index_url lexbuf }
+
+and extract_index_url = parse
+  | "<A HREF=\"" [^ '"']* '"'
+      { let s = lexeme lexbuf in
+	let n = String.length s in
+	String.sub s 9 (n - 10) }