<style type="text/css">
#kayan_reklamsol {position:fixed;top:0;left:0; text-align: center; margin: 0; width : 120px; margin-top:36px;}
#kayan_reklamsag {position:fixed;top:0;right:0; text-align: center; margin: 0; width : 120px; margin-top:36px;}
</style>

<div id="kayan_reklamsol">
sol reklam kodu
</div>
<div id="kayan_reklamsag">
sag reklam kodu
</div>