How to Detect OS 9 or OS X?

I need to detect whether the operating system on a Mac is OS X or OS 9 when i open a html file on a CD.
mDheatleyAsked:
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tomsterCommented:
One thing that comes to mind: try linking locally to a file on the CD via

/Volumes/<NameOfCD>/Path/To/File/file.html

if the link is not broken you can safely assume that you're on MacOSX

if

/<NameOfCD>/Path/To/File/file.html

works you're probably on MacOS 9

hth,

tom
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msentsCommented:
Do a browser check. The current browser versions for OS 9 are probably not going to change, so hard code for the version numbers (i.e. up to MSIE 5.14; Mac_PowerPC for Mac OS 9) but use a range for OS X (cf. MSIE 5.22+ for OS X). You can get the code for a browser check from any number of online sources.  
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