I created a drop down nav bar which works fine in FF but wont work in IE

here you can see that the menu loads fine in IE if the nav bar html and css are in their own file with no other html or css
http://www.tulsaview.com/new/navtest.php


here is the page with the same nav html added into my full site and the nav css added to my full css file and now it doesn't work in IE which indicates to me that something in my css file is causing a conflict, but I don't know what.
http://wwww.tulsaview.com/new

here is the link to view my css file - the code for the nav bar begins near bottom under /*Drop Down Nav Menu*/
http://tulsaview.com/new/template/default/css.css

maybe use position: fixed
this one is supported by IE since IE 7
about older IE like IE 6 do not have to care, Google or Facebook do neither

Thanks Rajib I found a menu on Dynamic Drive that I am using now instead and I have it working fine in both browsers.

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