Google is constantly combatting search engine spammers (I know some to do not like to be called this, so sorry). This past update, they began blocking an other type of spam named onmouseover JavaScript page redirects.
My understanding of how this spam tactic works is that when a searcher visits a page the second the mouse hovers over the page contents or background, the page redirects to a new page. So the first page (the one that initiates the redirect) contains keyword stuffed content that is not meant for the end user. Search engines rank this page high in the rankings and then when a searcher goes to it, they are automatically redirected.
Now Google is filtering out this type of spam tactic according to jimh009 at WebmasterWorld. GoogleGuy offers some support for those that were tricked into using this spam tactic by an unscrupulous SEO.
I know that we pulled the plug on some specific spam pages recently. If you paid an SEO and they somehow convinced you to put spam like sneaky redirects using an obfuscated JavaScript onMouseOver on the body tag on your pages, or other stuff like links to their doorway domains or their other clients, please make sure that you read http://www.google.com/webmasters/seo.html and http://www.google.com/webmasters/guidelines.html#quality before contacting Google. First, you need to make sure that you've removed any redirecting/spammy pages that were on your site. Make sure that every junky page like that is completely gone before you write, then you can send an email to webmaster [at] google.com with the subject line "reinclusion request" as give us as much detail as possible about the situation.I believe that one SEO had convinced clients either to put spammy Javascript mouseover redirects, doorway pages that link to other sites, or both on their clients' sites. That can lead to clients' sites being flagged as spam in addition to the doorway domains that the SEO set up.
Again, make sure you completely remove any doorway pages or links to spam that an SEO convinced you to put on your site before you write to Google about reinclusion. It reflects badly on your site if you write about reinclusion and then we check and the spam pages are still live on your site.
Good move Google - makes for happy searchers.
