<script type="text/javascript"><!--Фон -->
var Myimg="<img id=Myimg src=\"ссылка на картинку\" style=\"left:0!important;display:block;position:fixed!important;z-index:-1;width: 107%!important;margin: 0 4% 0 -4%;\"/>"
$("#pun").prepend(Myimg);</script>
<style>#Myimg {position:absolute;width:100%!important;height:100%!important;top:-10px!important;}
body{background-image:none;background-color:transparent!important;top:0!important;}
</style><!--end Фон -->