Thanks for the walk down my old bookshelves. There were some titles mentioned I forgot about years ago! Jeez i did a lot of reading... Cheers Alan ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please delete the e-mail & notify the system manager. We reserve the right to scan all e-mail traffic for restricted content and to monitor all e-mail traffic in general. The views and opinions expressed in this e-mail are those of the sender and do not necessarily reflect the views of the organisation by whom they are employed, except where the sender expressly and with authority states them to be so. This footnote also confirms that this email message has been checked for the presence of computer viruses and script. We believe but do not warrant that this e-mail is free from viruses. Responsibility for virus checking rests entirely with the recipient. 5 at 356 **********************************************************************