Within the following url "/admin/build/block" I have a region called "Header Top" and within it I have 3 blocks assigned to it.  One of the 3 blocks called "primary links" has 6 links and one of those links called "Home" has a URL link to the main page.  I would like to vary the URL of the "Home" link depending on the current page URL.  How would I implement this programmatically?

Thanks,
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John J. Mitchell