si los valores son actualizados manualmente por el usuario tanto "cant" como "valor"
el codigo generado es algo asi
<form name="liquida" method="post" action="">
<table width="80%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>Nombre</td>
<td>Cant</td>
<td>Valor</td>
<td>Total</td>
</tr>
<tr>
<td>Perico</td>
<td><label><input name="1" type="text" id="1" size="8" maxlength="8"></label></td>
<td><label><input name="valor1" type="text" id="valor1" size="8" maxlength="8"></label></td>
<td><label><input name="total1" type="text" id="total1" size="8" maxlength="8" readonly></label></td>
</tr>
<tr>
<td>Juan</td>
<td><label><input name="2" type="text" id="2" size="8" maxlength="8"></label></td>
<td><label><input name="valor2" type="text" id="valor2" size="8" maxlength="8"></label></td>
<td><label><input name="total2" type="text" id="total2" size="8" maxlength="8" readonly></label></td>
</tr>
<tr>
<td>Pedro</td>
<td><label><input name="3" type="text" id="3" size="8" maxlength="8"></label></td>
<td><label><input name="valor3" type="text" id="valor3" size="8" maxlength="8"></label></td>
<td><label><input name="total3" type="text" id="total3" size="8" maxlength="8" readonly></label></td>
</tr>
<tr>
<td>Carlos</td>
<td><label><input name="4" type="text" id="4" size="8" maxlength="8"></label></td>
<td><label><input name="valor4" type="text" id="valor4" size="8" maxlength="8"></label></td>
<td><label><input name="total4" type="text" id="total4" size="8" maxlength="8" readonly></label></td>
</tr>
</table>
</form>