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That's correct. In your HTML you have code as: [_this is the search icon and as it's created it fool some bots that there is file javascript(0) in current folder. So if i'm here: http://www.jasonfox.me/infographics/page/9/ then bot add file this as relative and full path became: http://www.jasonfox.me/infographics/page/9/javascript(0) and this is how 404 is make. Correct way is to replace "javascript(0);" with "javascript:void(0)" or with "#". Only this patch in WordPress theme (look around header.php) will stop 404s._](javascript(0);)