<html>
<head>
<script>
function incr()
{
var len = document.getElementById('txt').value;
document.getElementById('txt').style.width = 75+len.length*4+'px';
}
</script>
<body>
<input type='text' id='txt' onkeydown='incr()' style='width:75px' />
</body>
</html>
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