[sourcecode language="html"]
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Java script</title>
<style>
input[type=text]
{
width:50px;
text-align:center;
border:thin solid gray;
padding: 2px 5px 2px 5px;
border-radius: 3px 3px 3px 3px;
}
#result
{
width:60px;
background:#33CC66;
color: #FFFFFF;
font-weight:bold;
}
</style>
<script>
function show()
{
var f = document.getElementById("f");
var s = document.getElementById("s");
var r = document.getElementById("result");
r.value = new Number(f.value) + new Number(s.value);
}
</script>
</head>
<body>
<input type="text" id="f" onkeyup="show();"/>+<input type="text" id="s" onkeyup="show();"/>
<input type="text" id="result" readonly="true" />
</body>
</html>
[/sourcecode]
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