Untitled

<html>


<head>

<title>WCF</title>

<script type="text/javascript">


function computeWCF(temp, ws){

if(temp > 50){
  //display an error message
  document.getElementById('errorH3').innerHTML = 'Error-- '
  return NaN
}
else{
      if (ws <= 3) {

return temp
}

else {

return (35.74 + 0.6215 * temp + (0.4275 * temp - 35.75) * Math.pow(ws, 0.16))
}
}
</script>
</head>


<body>

<form>

<p/>Wind Speed:

<input type='text' id='ws' value =""/>

<p/>Temperature:

<input type='text' id='temp'/>

<p/>

<input type='button' value='computeWCF'

onclick= "var ws = parseFloat(document.getElementById('ws').value);

var temp = parseFloat(document.getElementById('temp').value);

document.getElementById('wcf').value = computeWCF(temp, ws);"/>

<hr/>

<p> The Wind Chill Factor is: <input type="text" id="wcf" size="4" value="" />

</p>

</form>

<h3> id='errorH3'> </h3>

</body>
</html>