<html>
<head>
</head>
<body>
<div >
var i=0;
document.getElementById('button').onclick=function(){
var a=document.getElementsByTagName('div'),l=a.length;
a[i++].style.display='none';
if(i>=l)i=0;
a[i].style.display='block';
}
</script>
</body>
</html>
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