<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<script type="text/javascript">
function tong()
{
a=parseInt(document.getElementById("so1").value);
b=parseInt(document.form1.so2.value);
tam=a+b;
document.getElementById("kq").value=tam;
}
function tong2(a,b)
{
a=parseInt(a);
b=parseInt(b);
document.getElementById("kq").value=a+b;
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post">
<p>
<label for="so1">Số 1::</label>
<input type="text" name="so1" id="so1">
</p>
<p>
<label for="so2">Số 2::</label>
<input type="text" name="so2" id="so2">
</p>
<p>
<label for="kq">Kết quả::</label>
<input type="text" name="kq" id="kq" disabled>
</p>
<p>
<input type="button" name="tinhtong" id="tinhtong" value="Tính Tổng" onClick="tong2(so1.value,so2.value)">
</p>
</form>
</body>
</html>
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