Find CD Drive letter with JS or HTML?


I am currently working on a hybrid CD where some of the content is on the internet and other content is on the CD. Links from the CD to the web is no problem but linking from the webpages back to the CD is a huge problem. I know it can be done because I’ve searched and people talk about it but will not supply or show the source code.

If anybody could help me on this that would be great.