<!Author: Emptrix>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<meta name="generator" content=
"HTML Tidy for Windows (vers 14 February 2006), see www.w3.org">
<title>Welcome</title>
<script type="text/javascript">
function calculate() {
var n1 = document.form1.num1_txt.value;
var n2 = document.form1.num2_txt.value;
if (isNaN(n1)) {
alert("Number 1 must be a number.");
document.form1.num1_txt.focus();
document.form1.num1_txt.value = "";
} else if (isNaN(n2)) {
alert("Number 2 must be a number.");
document.form1.num2_txt.focus();
document.form1.num2_txt.value = "";
} else if (n2 == "") {
alert("Number 2 is required.");
document.form1.num2_txt.focus();
document.form1.num2_txt.value = "";
} else if (n1 == "") {
alert("Number 1 is required.");
document.form1.num1_txt.focus();
document.form1.num1_txt.value = "";
}
var result = parseInt(n1) + parseInt(n2);
document.form1.result_txt.value=result;
}
</script>
</head>
<body>
<form name="form1" allow="" method="post">
<table>
<tr>
<td>Enter Number 1:</td>
<td><input type="text" name="num1_txt" value="" /></td>
</tr>
<tr>
<td>Enter Number 2:</td>
<td><input type="text" name="num2_txt" value="" /></td>
</tr>
<tr>
<td>Result:</td>
<td><input type="text" name="result_txt" value="" readonly="readonly" /></td>
</tr>
<tr>
<td><input type="button" name="button" value="calculate" onClick="calculate()" /></td>
</tr>
</table>
</form>
<textarea rows="20" cols="150">
<script type="text/javascript">
function calculate() {
var n1 = document.form1.num1_txt.value;
var n2 = document.form1.num2_txt.value;
if (isNaN(n1)) {
alert("Number 1 must be a number.");
document.form1.num1_txt.focus();
document.form1.num1_txt.value = "";
} else if (isNaN(n2)) {
alert("Number 2 must be a number.");
document.form1.num2_txt.focus();
document.form1.num2_txt.value = "";
} else if (n2 == "") {
alert("Number 2 is required.");
document.form1.num2_txt.focus();
document.form1.num2_txt.value = "";
} else if (n1 == "") {
alert("Number 1 is required.");
document.form1.num1_txt.focus();
document.form1.num1_txt.value = "";
}
var result = parseInt(n1) + parseInt(n2);
document.form1.result_txt.value=result;
}
</script>
</head>
<body>
<form name="form1" allow="" method="post">
<table>
<tr>
<td>Enter Number 1:</td>
<td><input type="text" name="num1_txt" value="" /></td>
</tr>
<tr>
<td>Enter Number 2:</td>
<td><input type="text" name="num2_txt" value="" /></td>
</tr>
<tr>
<td>Result:</td>
<td><input type="text" name="result_txt" value="" readonly="readonly" /></td>
</tr>
<tr>
<td><input type="button" name="button" value="calculate" onClick="calculate()" /></td>
</tr>
</table>
</form>
</textarea>
</body>
</html>
