In most browsers it is a simple matter to add additional fixed background images. Just add something like this below your body tag:
HTML Code:
<div style="display:block!important;display:none;width:50px;height:435px;position:fixed;top:0;left:0;background-image:url('http://www.users.bigpond.com/rmeeking/images/left.jpg')"></div>
Change the dimensions of the division to those of your image and the url for the image to that of the mirror image one. In IE, things are much more complicated and due to the fact that you have such involved css style (much more complex that it needs to be, I am sure) at various spots all over and attached to your page, not to mention the ads over which you have no control, it would be virtually impossible to use css. Perhaps a floating division type script could handle the duty for IE.
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