help with Xhtml, Dhtml, Javascript coding

I am working on an xhtml assignment. I am absolutely lost. Don't know much about Javascript. The instructor is difficult to get hold of at best. I've done what I can, but it doesn't work. I've found a finished copy online that does work...but doesn't when I copy the source file, paste it in and try to run it. At whits end. Help me make it work?

Assignment as well as all files associated with it is attached.


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Sudhindra A NCommented:
Check the zipped contents..

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needxhtmlhelpAuthor Commented:
Perfect. Thank you for the help.
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