Iframe-div conflict

In a drastic attempt to reduce iframe flickering, I’ve made the iframe background transparent thinking that I was going conjure a div fill to use as a static background. This would work if the filler was a solid color, but I’m using opacity features for design purposes, and therefore all of the content in the iframe is set to the opacity levels predetermined in the [url=http://www.nickadt.5u.com/newfolder/style/grey.css]stylesheet[/url]. (This problem is illustrated best you click on one of the menu options (in Mozilla).) Is there any way to solve this using CSS?

[url=http://www.nickadt.5u.com/newfolder/index.htm]Site with transparent iframe[/url]; [url=http://www.nickadt.5u.com/]site without transparent iframe (iframe flickering, no menu)[/url].

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