Yahoo! Answers - jumpingrightin's Question

<html>
<head>
<script type="text/javascript">
<!-- Original:  James P. Dildine (jpd@wlsmail.com) -->
<!-- Web Site:  http://www.mste.uiuc.edu/dildine -->


function windChill(form) {
//error checking
if (isNaN(form.wind.value) || isNaN(form.temp.value)) {
    if (isNaN(form.wind.value) && isNaN(form.temp.value)) {
        alert("The value you wrote in both text boxes are not valid numbers.");
        form.wind.value = "";
        form.temp.value = "";
        form.wind.focus();
    } else {
        if (isNaN(form.wind.value)) {
            alert("The value you wrote in the wind speed text box is not a valid number.");
            form.wind.value = "";
            form.wind.focus();
        } else {
            alert("The value you wrote in the air temperature text box is not a valid number.");
            form.temp.value = "";
            form.temp.focus();
        }
    }
    form.windchill.value = "";
    return false;
}
//calculate wind chill
var wind = eval(form.wind.value);
var temp = eval(form.temp.value);
var chill = (0.0817*(3.71*(Math.pow(wind, 0.5))+5.81-0.25*wind)*(temp-91.4)+91.4);
form.windchill.value = chill;
return false;
}
</script>
</head>
<body>
<form name="windform">

<div style="padding-left: 50%; margin-left: -130px;">
<div style="float: left; margin-right: 10px; width: 130px;">
<p style="margin: 15px 0;"> Wind Speed (MPH)</p>
<p style="margin: 15px 0;">Air Temperature (ºF)</p>
</div>

<div style="float: left; width: 130px;">
<input type="text" id="wind" name="wind" style="display: block; margin: 15px 0;">
<input type="text" id="temp" name="temp" style="display: block; margin: 15px 0;">
</div>
</div>

<div style="clear: both; text-align: center;">
<input type="submit" value="Calculate Wind Chill" onclick="return windChill(this.form)">
<br>
<input name="windchill" type="text" style="margin-top: 15px;"> ºF
</div>
</form>
</body>
</html>