IE6 alignment issues

My page looks fine and perfectly aligned in Safari on the mac, but in IE 6 on the PC it increases the width of my page so that it creates a scroll bar and probably 500+px of dead white space to the right (I have it set to fixed 1100px in ATO), pushes %bar1 way off to the right of the page, and changes the dimensions and alignment of links I have placed in the header area (they're all over the place). Any advice?

I am using Atahualpa 353-1 and WP 3.0.1.

I tried entering this script in ATO - CSS / Html inserts - header area but no luck: <!--[if lt IE 8]> <script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE8.js"></script> <![endif]-->