claro! si tengo el firefox y ahora mismo le instalo el complemente! t paso el html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento sin título</title>
<style type="text/css">
<!--
.Estilo3 {
font-family: Arial, Helvetica, sans-serif;
font-weight: bold;
font-size: 14px;
}
.Estilo4 {
font-size: 12px;
font-weight: bold;
}
.Estilo5 {
font-size: 14px;
font-family: Arial, Helvetica, sans-serif;
}
.Estilo6 {
font-size: 16px;
font-family: Arial, Helvetica, sans-serif;
font-weight: bold;
}
.Estilo7 {font-size: 16}
-->
</style>
</head>
<body>
<form id="form119" name="form119" method="post" action="">
<table width="780" height="221" border="1">
<tr>
<td width="146" height="48"><div align="center">SUNAT</div></td>
<td colspan="2"><div align="center" class="Estilo6">REGIMEN GENERAL</div></td>
<td width="150" rowspan="2" valign="top"><div align="center"><span class="Estilo3">USO BANCO</span>
<input name="textfield" type="text" disabled="disabled" id="textfield" />
</div>
<p>
<label></label>
<label></label>
</p></td>
</tr>
<tr>
<td rowspan="2"> </td>
<td width="226" rowspan="2" valign="top"><p align="center">Numero de Indetificacion tributaria<br />
RUC:
<label>
<input name="textfield3" type="text" id="textfield3" maxlength="11" />
</label>
</p> </td>
<td width="230" rowspan="2" valign="top"><p align="center" class="Estilo5">Periodo Tributario<br />
<label>
<select name="select" id="select">
<option>MES </option>
<option value="ENE">enero</option>
<option value="FEB">febrero</option>
<option value="MARZ">marzo</option>
<option value="ABR">abril</option>
<option value="MAY">mayo</option>
<option value="JUN">junio</option>
<option value="JUL">julio</option>
<option value="AGOST">agosto</option>
<option value="SET">setiembre</option>
<option value="OCT">octubre</option>
<option value="NOV">noviembre</option>
<option value="DIC">diciembre</option>
</select>
</label>
<label>
<select name="select2" id="select2">
<option>AÑO</option>
<option>2000</option>
<option>2001</option>
<option>2002</option>
<option>2003</option>
<option>2004</option>
<option>2005</option>
<option>2006</option>
<option>2007</option>
<option>2008</option>
</select>
</label>
<br />
</p>
<p>
<label></label>
<label></label>
</p></td>
</tr>
<tr>
<td height="41" valign="top"><div align="center"><span class="Estilo4">N· DE ORDEN</span>
<input name="textfield2" type="text" disabled="disabled" id="textfield2" />
</div>
<label></label></td>
</tr>
<tr>
<td height="83" colspan="4" valign="top"><div align="center">Apellido Nombre, Denominacion o razon Social
<input name="textfield5" type="text" id="textfield5" size="100" maxlength="50" />
</div>
<p>
<label></label>
</p></td>
</tr>
</table>
<br />
<table width="780" border="1">
<tr>
<td width="55" rowspan="3" class="Estilo6"><div align="center">IGV</div></td>
<td width="341">Ventas gravadas netas</td>
<td width="174">100
<label>
<input name="C100" type="text" id="C100" onkeyup="calcularIGV(form119);" />
</label></td>
<td width="182">101
<label>
<input name="C101" type="text" id="C101" value="0" readonly="true" />
</label></td>
</tr>
<tr>
<td>Compras destinatario</td>
<td>107
<label>
<input name="C107" type="text" id="C107" onkeyup="calcularIGV(form119);" />
</label></td>
<td>108
<label>
<input name="C108" type="text" id="C108" value="0" readonly="true" />
</label></td>
</tr>
<tr>
<td>impuesto resultante</td>
<td>Trasladar a la casilla 140</td>
<td><span class="Estilo7">A
<label>
<input name="CAMPOA" type="text" id="CAMPOA" value="0" readonly="true" />
<script type="text/javascript">
function calcularIGV(form){
form.C101.value = parseFloat(form.C100.value) * 0.19;
form.C108.value = parseFloat(form.C107.value) * 0.19;
form.CAMPOA.value = parseFloat(form.C101.value) - parseFloat(form.C108.value);
}
function porcentaje(form){
form.CAMPOB.value = parseFloat(form.C103.value) * 0.06;
}
</script>
</label>
</span></td>
</tr>
</table>
<table width="780" border="1">
<tr>
<td width="136">RENTA <br />
Cuenta Propia<br />
Tercera categoria</td>
<td width="148">pago a Cuenta Mensual</td>
<td width="194">301
<label>
<input name="C301" type="text" id="C301" onkeyup="porcentaje(form119);" value="0" />
</label></td>
<td width="274">B:
<label>
<input name="CAMPOB" type="text" id="CAMPOB" value="00.00" />
</label></td>
</tr>
</table>
<table width="780" border="1">
<tr>
<td colspan="2">DETERMINACION DE LA DEUDA TRIBUTARIA</td>
<td>IGV</td>
<td colspan="2">RENTA cuenta propia 3categoria</td>
</tr>
<tr>
<td>Impuesto Resultante o Saldo a Favor</td>
<td>140</td>
<td width="105"><label>
<input type="text" name="C140" id="C140" />
</label></td>
<td width="42">312</td>
<td width="140"><label>
<input type="text" name="C312" id="C312" />
</label></td>
</tr>
<tr>
<td width="428">Saldo a favor del periodo anterior</td>
<td width="31">145</td>
<td><label>
<input type="text" name="C145" id="C145" />
</label></td>
<td colspan="2" bgcolor="#999999"> </td>
</tr>
<tr>
<td><span class="Estilo4">TRIBUTO A PAGAR O SALDO A FAVOR</span>(casilla impto-</td>
<td>C</td>
<td><label>
<input type="text" name="CAMPOC" id="CAMPOC" />
</label></td>
<td>D</td>
<td><label>
<input type="text" name="CAMPOD" id="CAMPOD" />
</label></td>
</tr>
<tr>
<td><span class="Estilo4">Pagos Anticipados</span>(efectivo, cheque y/o Doc Valorados)</td>
<td>E</td>
<td><label>
<input type="text" name="CAMPOE" id="CAMPOE" />
</label></td>
<td>F</td>
<td><label>
<input type="text" name="CAMPOF" id="CAMPOF" />
</label></td>
</tr>
<tr>
<td>Interes Moratorio</td>
<td>I</td>
<td><label>
<input name="textfield12" type="text" disabled="disabled" id="textfield12" />
</label></td>
<td>J</td>
<td><label>
<input type="text" name="CAMPOJ" id="CAMPOJ" />
</label></td>
</tr>
<tr>
<td>Total Deuda Tributaria(casilla saldo a pagar+casilla interes moratorio)</td>
<td>K</td>
<td><label>
<input type="text" name="CAMPOK" id="CAMPOK" />
</label></td>
<td>L</td>
<td><label>
<input type="text" name="CAMPOL" id="CAMPOL" />
</label></td>
</tr>
</table>
<table width="780" border="1">
<tr>
<td width="422">IMPORTE A PAGAR</td>
<td width="32">189</td>
<td width="104"><label>
<input type="text" name="C189" id="C189" />
</label></td>
<td width="48">325</td>
<td width="140"><label>
<input type="text" name="C325" id="C325" />
</label></td>
</tr>
</table>
<p> </p>
</form>
</body>
</html>