CSS menu problem – Mac

I created this navigation using many online walk-through’s and it works perfectly in IE and FF on the PC side. I just hopped on a Mac, however, and the placement is still perfect BUT the pop-ups are showing underneath the div’s on the right side of the page… anyone know what I did wrong? stylesheet is linked..

Here’s the page: getousset.com/eqinc

Thanks for any and all help!!

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