Google Pagerank dropped for my website

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Hello to everyone,

I am the owner of [see signature for website] and have recently updated my site about 3 months ago. Since about a month ago my website has dropped in Google Pagerank for no apparent reason.

Nothing was changed drastically, mostly cosmetic updates. Has anyone has had there Google Pagerank dropped in similar circumstances. The good news is that my position within the search engines for the most part has not change much as I still hold positions for my target keywords.

thanks