num =0;

var ADarray = new Array("ad00","ad01");
var flag ="ad000";


window.onload = Bannerinit;
function Bannerinit(){

Mybanner=document.getElementById(ADarray[num]);
Mybanner.style.display='block';
if(flag=="ad000"){flag=document.getElementById(ADarray[num+1]);};
flag.style.display='none';
flag=Mybanner;flag
num++;
num %= ADarray.length;

timer=setTimeout('Bannerinit()',10000);
}