Untitled

<!DOCTYPE html>
<html>

<head>
    <meta charset="Utf-8">
</head>

<body>

    <script type="text/javascript">
    function run(a, b, c)
    {
    //   тут магия
    }
    </script>

    <form method="post" action="javascript" enctype="text/plain" onsubmit="run(a, b, c);">
            <input type="number" name="a" id="a" size="20">   a <BR>
            <input type="number" name="b" id="b" size="20">   b <BR>
            <input type="number" name="c" id="c" size="20">   c <BR>
            <input type="submit" value="Submit">
    </form>

</body>

</html>