<html lang="en">
<head>
<script>
var totalCount = 10;
function ChangeIt() {
window.setTimeout( "ChangeIt()", 2000);
var num = Math.floor( Math.random() * totalCount );
document.body.background = 'images/'+num+'.png';
document.body.style.backgroundRepeat = "repeat";
}
</script>
</head>
<body onload="ChangeIt();"></body>
</html>
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if you have any doubts , please let me know