Thanks for that, we will be trying it at around 12:00 when he is not so busy. I have made the change at the server, so its fingers crossed....
You will need to add the domain name to the list of search addresses in the dns settings for the network connection. .local is reserved for the macs local use. If its os x 10.3 then that won't work and there is an article on apples site detailing what to edit.