how can i trace and remove that box?
it appears on right down corner and looks like it position is relative

when i inspect the element with firebug i get this :

<div id="aAdContainer" style="position: fixed; margin-top: 15px; bottom: 0px; right: 5px; width: auto; height: 250px; z-index: 9999; text-align: center;">
<div style="position: relative; width: 300px; height: 250px; margin: auto; background-color: #ffffff; border: 1px solid #dedede;">

but i cant find it in my public html