This is a good reason to always keep backups. There may even be one. If your former webmaster was doing things by the book, he/she kept at least one local copy of all the work. I don't know how delicate that situation may or may not be, but you could try contacting his/her family and asking about the possibility of looking at the computer used to find it. Or having one of them look for you.
Any other solution from us would require giving us a link to the website and explaining which page(s) are supposed to have the menu on them. It may be a simple syntax or other easily correctable error we could see by examining the source code:
Please post a link to the page on your site that contains the problematic code so we can check it out.
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