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joshie76 - 8:54 am on Aug 23, 2001 (gmt 0)
Create an instance of the FileSystemObject, point it at your files and use the DateLastModified property: More details on using the FileSystemObject are onBrainJar [brainjar.com]. obviously you'll need to drop a cookie that tells the server when the user last visited.
Doing it on the server, using ASP say, is pretty easy.