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<html>
<body>
<script type="text/javascript" >
function newline(){
var taVal = document.getElementById('ta').value;
if(taVal != null && taVal.length > 0){
var len = Number(taVal.length);
if(len%10 == 0) {
document.getElementById('ta').value = document.getElementById('ta').value + "\n";
}
}
}
</script>
<textarea id="ta" onkeypress="newline()"></textarea>
</body>
</html>