TECH need a little help with a portfolio site

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Decided to change up my portfolio site slightly, but I'm having a really hard time with the jquery. I can't seem to get the nav bar to clear the previous panel and only display the information correlating to the menu item you clicked.

http://jeffmullerdesign.com

 

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This should give you some guidance: http://jqueryfordesigners.com/jquery-tabs/

Thanks, I changed it up a bit but it doesn't look as nice. Oh well.

 

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you guys think the site is too dark?