HTML Custom Calculator

I am looking for an alternative way to code the following:

<script type="text/javascript">// <![CDATA[
 hide this script from old browsers
function temp(form)
{
  var f = parseFloat(form.DegF.value, 10);
	var g = parseFloat(form.DegG.value, 10);
	var h = parseFloat(form.DegH.value, 10);
  var c = 0;
	  c = (f * 2)+ (g * 4);
  form.DegC.value = c;
	var d = 0;
	  d = ((h * .02) * 12) + (c * 12) ;
  form.DegD.value = d;
}
<!-- done hiding from old browsers
// ]]></script>
<form>
<h2>What Is Your Estimated Rewards Value With FTR?</h2>
Enter how many people you are connected to on Facebook, Twitter, Email, Etc: <input type="text" name="DegF" value="0" size="15" maxlength="15" /> 
<br /> 
Enter how many businesses you are connected to on LinkedIn, Email, Etc: <input type="text" name="DegG" value="0" size="15" maxlength="15" /> 
<br /> 
nter how many times you share comments, pictures, videos, etc with your networks every month: <input type="text" name="DegH" value="0" size="15" maxlength="15" /> 
<br /> 
<p>
Click this button to calculate Your Rewards: <INPUT NAME="calc" VALUE="Calculate" TYPE=BUTTON onClick=temp(this.form)>
<p>
 <br /> Your Estimate Monthly Rewards Would Be $ <input type="text" name="DegC" readonly="readonly" size="15" /> <br /> Your Estimate Annual Rewards Would Be $ <input type="text" name="DegD" readonly="readonly" size="15" /></form>

We were able to imbed the previous code into our system however it would only work on Firefox. After testing out other formats for calculators, we found only on will work on our system. Example:

<form>
<input type=text name=userinput>
<input type=button
onKeyPress="if(document.all){var k=event.keyCode;}else{var k=event.which;}if(!(k>=48&&k<=57)){return false;}"
onClick="var saved=(15-8)*this.form.userinput.value;alert('You saved '+saved);">
</form> 

We need the first code to be converted to the code just about with out the pop up window for results.

Any suggestions?