I have a competitor who is using some links I'm not familiar with. Here is just a part of the source code;provides</a> <a href="http://www.ozzu.com/other-google-information-and-resources/portfolio.htm" class="plain">business-driven The words "business-driven" on the page look like normal text and not a link. But when you put your mouse over them, they're a link to another page on their site.I just wondered if that's a hidden link or if it's legimate?skIt is just formatted via CSS (see the class attribute). So it is not illegal. A hidden link would be one situated outside the viewable area or one which has the same color as the background (thus being invisible to people but quite visible to crawlers).