<html>
<head>
<script>
function convert(degree)
{
if (degree=="C")
{
F=document.getElementById("c").value * 9 / 5 + 32;
document.getElementById("f").value=Math.round(F);
}
else
{
C=(document.getElementById("f").value -32) * 5 / 9;
document.getElementById("c").value=Math.round(C);
}
}
</script>
</head>
<body>
<p></p><b>Insert a number into one of the input fields below:</b>
<form>
<input id="c" name="c" onkeyup="convert('C')"> degrees Celsius<br>
equals<br>
<input id="f" name="f" onkeyup="convert('F')"> degrees Fahrenheit
</form>
<p>Note that the <b>Math.round()</b> method is used, so that the result will be returned as an integer.</p>
</body>
</html>