Layering with z-index

Looking for some guidance on using z-index in my CSS to position the YouTube video on the home page of this site behind the drop down navigation. It is not a problem on my Mac (Firefox & Safari), where the layering is correct, but on my iPhone and my client's PC, the video is in front of the navigation.
http://www.simplycommunicating.ca
I have tried positioning with z-index, but seem not to be accomplishing this correctly. Any suggestions would be greatly appreciated!
Thank you

You need to position the z-index element for it to work. Recommend using absolute or relative as position:fixed doesn't work well on iPhones/iPads.
Z-Index guide
http://www.smashingmagazine.com/2009/09/15/the-z-index-css-property-a-comprehensive-look/
Also, pre-IE8 browsers have a z-index bug you should be aware of.
http://jonathanstegall.com/2009/01/15/ie-z-index-bug-with-css-dropdown-menu/
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
http://alt-web.com/
http://twitter.com/altweb

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