<html>
<head>
<script>
function swap()
{
var txt = document.getElementById('t1').value;
document.getElementById('t1').value = document.getElementById('t2').value;
document.getElementById('t2').value = txt;
}
</script>
</head>
<body>
<input type="text" id="t1">
<input type="text" id="t2">
<br>
<input type="button" value="Swap" onclick="swap()">
</body>
</html>
for more http://makeitsimple.co.in/js_programs.php
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