Jon Henning wrote Without seeing the script it is hard to say, but most likely your issue is in the referencing of elements on the page by id, which in a framework such as DNN which uses usercontrols causes the ids to change (be prefixed) to guarantee uniqueness.  See this post for more info.

Hi thanks for the tip, but it still won't work.  Here is the original code that works outside of DotNetNuke.

<SCRIPT LANGUAGE="JavaScript">
    <!-- Hide JavaScript from Java-Impaired Browsers

   function calculate() {
    var Stack1 = 0,Stack2 = 0,Stack3 = 0,Stack4 = 0;
    Stack1 = ((document.FWform.AL1.value * document.FWform.AW1.value * document.FWform.AH1.value)/1728)/128;
    Stack2 = ((document.FWform.AL2.value * document.FWform.AW2.value * document.FWform.AH2.value)/1728)/128;
    Stack3 = ((document.FWform.AL3.value * document.FWform.AW3.value * document.FWform.AH3.value)/1728)/128;
    Stack4 = ((document.FWform.AL4.value * document.FWform.AW4.value * document.FWform.AH4.value)/1728)/128;
    document.FWform.CordsDelivered.value = Math.round((Stack1 + Stack2 + Stack3 + Stack4)*100)/100;
    document.FWform.AmountShort.value = Math.round((document.FWform.AmtOrdered.value - document.FWform.CordsDelivered.value)*100)/100;
    document.FWform.Overcharge.value = Math.round((document.FWform.AmountShort.value * document.FWform.CostCord.value)*100)/100;
   }
 
    // End Hiding -->
    </SCRIPT>

    <form name="FWform">
   
      <ul>
        <font size = "4">
        <li>Take at least three measurements for each dimension to get an average.</li>
        <li>Input averages in appropriate box for each stack.</li>
        <li>Click the &quot;Calculate&quot; button to get the total number of cords and dollar amount short.</li>
        <li>To file a complaint or for more information call Butte County Weights &amp; Measures at 891-2756.</li>
        </font>
      </ul>
     
      <hr>
 
      <table border="0" cellpadding="0" cellspacing="0" width="100%">
        <tr>
          <th width="50%" height="35"><p align="center">Number of Cords Ordered:</th>
          <th width="50%" height="35"><p align="center">Cost per Cord:</th>
         
        </tr>
        <tr>
          <td width="50%" height="35"><p align="center"><input type="text" name="AmtOrdered" size = "10"></td>
          <td width="50%" height="35"><p align="center"><input type="text" name="CostCord" size="10"></td>
        </tr>
      </table>
 
      <hr>

      <table border="0" cellpadding="0" cellspacing="0" width="100%">
        <tr>
          <td width="25%" height="35"></td>
          <th width="25%" height="35" align="center">Average Width in Inches</th>
          <th width="25%" height="35" align="center">Average Height in Inches</th>
          <th width="25%" height="35" align="center">Average Length in Inches</th>
        </tr>
        <tr>
          <th width="25%" height="35" align="right">Stack 1</th>
          <td width="25%" height="35"><p align="center"><input type="text" name="AW1" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AH1" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AL1" size="10"></td>
        </tr>
        <tr>
          <th width="25%" height="35" align="right">Stack 2</th>
          <td width="25%" height="35"><p align="center"><input type="text" name="AW2" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AH2" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AL2" size="10"></td>
        </tr>
        <tr>
          <th width="25%" height="35" align="right">Stack 3</th>
          <td width="25%" height="35"><p align="center"><input type="text" name="AW3" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AH3" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AL3" size="10"></td>
        </tr>
        <tr>
          <th width="25%" height="35" align="right">Stack 4</th>
          <td width="25%" height="35"><p align="center"><input type="text" name="AW4" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AH4" size="10"></td>
          <td width="25%" height="35"><p align="center"><input type="text" name="AL4" size="10"></td>
        </tr>
      </table>

      <hr>

      <p align="center"><input type="button" value="Calculate" name="Calculate" onClick="calculate();"></p>

      <hr>

      <table border="0" cellpadding="0" cellspacing="0" width="100%">
        <tr>
          <th width="33%" height="35">Number of Cords Delivered</th>
          <th width="33%" height="35">Amount Short</th>
          <th width="34%" height="35">Dollar Overcharge</th>
        </tr>
        <tr>
          <td width="33%" height="35"><p align="center"><input type="text" name="CordsDelivered" size="10"></td>
          <td width="33%" height="35"><p align="center"><input type="text" name="AmountShort" size="10"></td>
          <td width="34%" height="35"><p align="center"><input type="text" name="Overcharge" size="10"></td>
        </tr>
      </table>

    </form>

I would appreciate it if anyone could help me out.  Thanks.