Wordpress Themes - WP Forum at BFA - Problems with Internet Explorer 6 & 7...surprise surprise

Version: Atahualpa 3.6.4
Site: http://www.beyondgracethemovie.com
WP Version: 3.1

First thank you for the theme, it's a lot of fun to work with and this is the 3rd site I've built with it:) My site looks beautiful on Firefox, Chrome, Safari & IE 8, but the logo isn't displaying correctly (like it does on the other browsers) in ie 6 and 7. Wondering if any of the Ata Geniuses can help me out with this? The code I'm using to style the logo is:

Code:

#logo {

    background: url("http://www.beyondgracethemovie.com/wp-content/themes/atahualpa364/images/bg_newlogo.png") no-repeat scroll 0 0 transparent;

    height: 430px;

    margin-left: -95px;

    position: fixed;

    top: 142px;

    width: 10%;

    z-index: 9999;

}

I'm aware that this could be totally wrong. Any thoughts on how I might fix this? I am happy to provide a admin login if necessary.
Thanks!
Ps. Paypal tips will follow when I get some $$ in my account.