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<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=UTF-8 ">
<script>
var timer = 0;
window.onload=function(){
timer = setInterval("abc()",1000)
}
function abc(){
var a = document.getElementById("demo");
var time = parseInt(a.innerHTML);
a.innerHTML = time-1;
}
function bcd(){
clearInterval(timer);
}
function efg(){
timer = setInterval("abc()",1)
}
</script>
</head>
<body>
<div id="demo" onmouseover="bcd()" onmouseout="efg()" style="border:1px solid black">
1000
</div>
</body>
</html>