Probably the thing to do would be to create an HTML form to input the data and use Javascript as the back end to take the input calculate the result and display the answer.
Here is a simplified example of such a calculator
[html]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Calculator</title>
<script type="text/Javascript">
<!--
function Calculate()
{
var Op1 = document.getElementById("Op1");
var Op2 = document.getElementById("Op2");
var Answer = document.getElementById("Answer");
if ( Op1 && Op2 && Answer )
{
var result = eval(Op1.value) + eval(Op2.value);
Answer.innerHTML = result;
}
}
//-->
</script>
</head>
<body>
<form id="Calc">
<table>
<tr>
<th><label for="Op1">Operand 1</label></th>
<td><input type="text" id="Op1" name="Op1"></td>
</tr>
<tr>
<th><label for="Op2">Operand 2</label></th>
<td><input type="text" id="Op2" name="Op2"></td>
</tr>
<tr>
<th>Answer</th>
<td id="Answer">???</td>
</tr>
<tr>
<td colspan="2" class="text-align:center;"><input type="button" onclick="Calculate()" value="Sum"></td>
</tr>
</table>
</form>
</body>
</html>
[/html]
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