These forums are for self-hosted WordPress sites only. That does not appear to be a WordPress site.
adding fixed html containers outside the boundaries of a theme is a pure html excercise (not much to do with WordPress).
keyword: css positioning
if you would like to get any suggestions, please post a link to your own site to illustrate where you want the banners.
the above link was for example.
my site is http://www.iseetexam.com/
possibly add the divs for the banners just after <div id="header"> into header.php of your theme;
example:
<div class="banner-left">whatever code for left banner</div>
<div class="banner-right">whatever code for right banner</div>
necessary css:
#header { position: relative; }
#outer-wrapper { padding-left: 160px; padding-right: 160px; }
.banner-left, .banner-right {
position: absolute; top: 175px;
width: 150px; min-height: 400px;
background: #eee; }
.banner-left { left: -160px; }
.banner-right { right: -160px; }
http://www.w3schools.com/css/css_positioning.asp
imho, extra banners will only deter users with a normal browser screen size – http://browsersize.googlelabs.com/
