js qui marche sous IE mais pas FF : pourquoi ?

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <title>devis4</title>
</head>
<body>
<br>
<br>
<br>
<br>
<br>
<script language="javascript" type="text/javascript">
 
 
 
 
function calc_sous_total(prix, qte, type)
{
    sous_total=prix*qte;
    document.getElementById("total_"+type).value=sous_total;
 
    calc_total();
}
 
function calc_total()
{   total_fr = (document.getElementById("total_fr").value!="") ? document.getElementById("total_fr").value : 0;
	total_npn = (document.getElementById("total_npn").value!="") ? document.getElementById("total_npn").value : 0;
	total_npa = (document.getElementById("total_npa").value!="") ? document.getElementById("total_npa").value : 0;
	total_d = (document.getElementById("total_d").value!="") ? d=document.getElementById("total_d").value : 0;
	total=parseFloat(parseFloat(total_fr,10)+parseFloat(total_npn,10)+parseFloat(total_npa,10)+parseFloat(total_d,10));
 
    document.getElementById("total").value=total;
}
 
 
</script>
<script language="javascript" type="text/javascript">
total=0;
</script>
 
<form action="" name="form" method="post">
 <table bgcolor="C596FF">
    <tbody>
      <tr>
        <td colspan="4" bgcolor="black"><font
 color="white" face="Arial">Remplissez les champs
utiles</font> </td>
      </tr>
      <tr bgcolor="grey">
        <td><font color="white" face="Arial">1-
Tarif de base</font></td>
        <td><font color="white" face="Arial">Prix
unitaire</font></td>
        <td><font color="white" face="Arial">Quantit&eacute;</font></td>
        <td><font color="white" face="Arial">Total</font></td>
      </tr>
      <tr>
        <td><font color="white" face="Arial"
 size="2">Frais
de r&eacute;alisation (gratuit) :</font></td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10" name="px_fr"
 value="0" type="text" disabled="disabled">&euro;</td>
              <td width="40"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="50"></td>
              <td><input size="2" maxlength="10" name="q_fr"
 value="1" type="text" disabled="disabled"></td>
              <td width="50"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10" name="total_fr"
 value="0" type="text"></td>
              <td width="40">&euro;</td>
            </tr>
          </tbody>
        </table>
        </td>
      </tr>
      <tr bgcolor="grey">
        <td><font color="white" face="Arial">2-
Vos choix</font></td>
        <td></td>
        <td></td>
        <td></td>
      </tr>
     <tr>
        <td><font color="white" face="Arial"
 size="2">Nombres
de photos numériques :</font></td>
        <td>	
 <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10"
 value="0.9" name="px_npn" type="text" disabled="disabled">&euro;</td>
              <td width="40"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="50"></td>
              <td><input size="2" maxlength="10"
 value="" name="q_npn" id="q_npn" type="text" onkeyup="calc_sous_total(px_npn.value, this.value, 'npn')"></td>
              <td width="50"></td>
            </tr>
          </tbody>
        </table>		
 
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10"
 value="0" name="total_npn" id="total_npn"  type="text"></td>
              <td width="40">&euro;</td>
            </tr>
          </tbody>
        </table>
        </td>
 
      </tr>
      <tr>
        <td><font color="white" face="Arial"
 size="2">Nombres
de photos argentiques (papier) :</font></td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10"
 value="1.1" name="px_npa" type="text" disabled="disabled">&euro;</td>
              <td width="40"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="50"></td>
              <td><input size="2" maxlength="10"
 value="" name="q_npa" id="q_npa" type="text" onkeyup="calc_sous_total(px_npa.value, this.value, 'npa')"></td>
              <td width="50"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10"
 value="0" name="total_npa" id="total_npa"  type="text"></td>
              <td width="40">&euro;</td>
            </tr>
          </tbody>
        </table>
        </td>
 
      </tr>
      <tr>
        <td><font color="white" face="Arial"
 size="2">Nombres
de diapositives
:</font></td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10"
 value="2.0" name="px_d" type="text" disabled="disabled">&euro;</td>
              <td width="40"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="50"></td>
              <td><input size="2" maxlength="10"
 value="" name="q_d" id="q_d" type="text" onkeyup="calc_sous_total(px_d.value, this.value, 'd')"></td>
              <td width="50"></td>
            </tr>
          </tbody>
        </table>
        </td>
        <td>
        <table>
          <tbody>
            <tr>
              <td width="40"></td>
              <td><input size="5" maxlength="10"
 value="0" name="total_d" id="total_d" type="text" ></td>
              <td width="40">&euro;</td>
            </tr>
          </tbody>
        </table>
        </td>
      </tr>
	  <tr bgcolor=grey><td></td><td></td><td>Total (TTC)</td> <td><input size="5" maxlength="10" value="0"
 name="total" id="total" type="text"></td></tr>
    </tbody>
</td></tr>  </table>
  <br>
  <br>
 
</form>
 
 
</body>
</html>
marche sous IE mais pas sous FF. En gros, c'est pour faire un devis (Ce n'est qu'un essai ; ce n'est pas fini). Que faut-il faire pour que ça marche ?