<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
function Add() {
var txt1 = document.getElementById('Number1');
var txt2 = document.getElementById('Number2');
var txtResult = document.getElementById('Result');
if (txt1 && txt2 && txtResult) {
txtResult.value =parseInt(txt1.value,10) +parseInt(txt2.value,10);
}
}
</script>
</head>
<body>
<input type="text" id="Number1" />+
<input type="text" id="Number2" />
<input type="button" value="=" onclick="Add()" />
<input type="text" id="Result" readonly="readonly" />
</body>
</html>
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