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Consider http://mindprod.com/index.html There is a line 46. <script type="text/javascript">if (document.URL.indexOf("file:")!=0){document.writeln("<div class=\"g-plusone\"><"+"/div>");}</script> Note the way I had to artificially break the string in two to avoid a false error. I would have more naturally written it: <script type="text/javascript">if (document.URL.indexOf("file:")!=0){document.writeln("<div class=\"g-plusone\"></div>");}</script>
http://validator.w3.org/docs/help.html#faq-javascript -> http://www.htmlhelp.com/tools/validator/problems.html#script