HTML Links not working

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HTML

Hi,

I have got a very wierd problem with my HTML page. It is a simple frame with 4 links on left side and upon the clicking of links, the right side of the frame, the respective pages are loaded. Recently I was asked to add new image to one of the pages.

Now is the weirdest part!!!

After I added the image to page, it was initially not working and after breaking my head for few hours, I made a new copy of the HTML page under different folder and it worked. But after I replaced the old HTML document with my new one, the frame links are not working... I didn't make any changes to my links document. I just tried replacing the old doc with new one and now that link is not working.

I know it is terribly wierd. But please help on this!!!