If I am including latest jQuery 1.6 build in the end of markup just before body element the background image applied to html element is not showing in opera if you go full screen background will appear and stay there until you refresh the page. If i include jquery 1.5 everything works fine in opera.

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Buggy version in opera

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<script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.js"></script>

<script>window.jQuery || document.write("<script src='assets/js/libs/jquery-1.6.1.min.js'>\\x3C/script>")</script>

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Working version in opera

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<script src="//ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.js"></script>

<script>window.jQuery || document.write("<script src='assets/js/libs/jquery-1.5.1.min.js'>\\x3C/script>")</script>