I added the tabs, much better than before

Here is how it looks now Quantnet.org - Financial Engineering Forum

Where did you include the images over the tab ? I saw that you have roll over image but the guide you post just have basic bar.

Also, why you have the if show member condition there ?

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quantnet (v) : to read, post, reply to a topic on Quantnet.org. Example "Can you quantnet that article ?"
quantnet (n) : Quantnet.org - a community for people to exchange ideas about quantitative finance