<script type="text/javascript">   

   adTime=10; // seconds ad reminder is shown   

   chanceAd=1; // ad will be shown 1 in X times (put 1 for everytime)   

   var ns=(document.layers);   

   var ie=(document.all);   

   var w3=(document.getElementById && !ie);   

   var calunit=ns? "" : "px"   

   adCount=0;   

   function initAd(){   

   if(!ns && !ie && !w3) return;   

   if(ie) adDiv=eval('document.all.byn.style');   

   else if(ns) adDiv=eval('document.layers["byn"]');   

   else if(w3) adDiv=eval('document.getElementById("byn").style');   

   randAd=Math.ceil(Math.random()*chanceAd);   

   if (ie||w3)   

   adDiv.visibility="visible";   

   else   

   adDiv.visibility ="show";   

   if(randAd==1) showAd();   

   }   

   function showAd(){   

   if(adCount<adTime*10){adCount+=1;   

   if (ie){documentWidth =truebody().offsetWidth/2+truebody().scrollLeft-20;   

   documentHeight =truebody().offsetHeight/2+truebody().scrollTop-20;}   

   else if (ns){documentWidth=window.innerWidth/2+window.pageXOffset-20;   

   documentHeight=window.innerHeight/2+window.pageYOffset-20;}   

   else if (w3){documentWidth=self.innerWidth/2+window.pageXOffset-20;   

   documentHeight=self.innerHeight/2+window.pageYOffset-20;}   

   adDiv.left=documentWidth-200+calunit;adDiv.top =documentHeight-200+calunit;   

   setTimeout("showAd()",100);}else closeAd();   

   }   

   function closeAd(){   

   if (ie||w3)   

   adDiv.display="none";   

   else   

   adDiv.visibility ="hide";   

   }   

   function truebody(){   

   return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body   

   }   

   onload=initAd;   

   //End-->   

   </script>

<div id="byn" style="visibility:hidden">   
   <div style="width: 100%; text-align: center;">   

   СЮДА ВАШ БЛОК   

   </div>   
   </div>