scusami ancora ma da errore
ti ridico il codice


<form name=somme>

<script language="javascript">
function somma() {

document.somma.risultato.value = parseFloat(document.somme.qclassicblack.value) + parseFloat(document.somme.qclassicyellow.value) + parseFloat(document.somme.qclassicred.value) + parseFloat(document.somme.qclassicorange.value) + parseFloat(document.somme.qclassicblue.value) + parseFloat(document.somme.qclassicgreen.value) + parseFloat(document.somme.qclassicwhite.value) + parseFloat(document.somme.qclassicpurple.value) + parseFloat(document.somme.qclassicsilver.value) + parseFloat(document.somme.qclassicneon.value) + parseFloat(document.somme.qclassicexplorer.value) +

}
</script>


<tr>
<td width="38" bgcolor="#000000" height="60" align="center"><font color="#800000" size="2" face="Tahoma"> <input size="3" id="qclassicblack" type=text value="0" name="qclassicblack"></font></td>
<td width="45" bgcolor="#FFFF00" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicyellow" type=text value="0" name="qclassicyellow"></font></td>
<td width="30" bgcolor="#FF0000" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicred" type=text value="0" name="qclassicred"></font></td>
<td width="48" bgcolor="#FF8000" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicorange" type=text value="0" name="qclassicorange"></font></td>
<td width="32" bgcolor="#0000FF" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicblue" type=text value="0" name="qclassicblue"></font></td>
<td width="38" bgcolor="#008000" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicgreen" type=text value="0" name="qclassicgreen"></font></td>
<td width="30" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicwhite" type=text value="0" name="qclassicwhite"></font></td>
<td width="38" bgcolor="#800080" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicpurple" type=text value="0" name="qclassicpurple"></font></td>
<td width="38" bgcolor="#C0C0C0" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicsilver" type=text value="0" name="qclassicsilver"></font></td>
<td width="38" bgcolor="#CCFF00" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicneon" type=text value="0" name="qclassicneon"></font></td>
<td width="50" height="60" background="explorer.gif" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" id="qclassicexplorer" type=text value="0" name="qclassicexplorer"></font></td>
<td width="44" height="60" align="center"><font color="#800000" size="2" face="Tahoma"><input size="3" type="button" value="TOT" onclick="somma()">
<input type="text" name="risultato">

</font></td>
</tr>

</form>

da errore quando clicco sul pulsante ciao