Maldito formulario III

[palidowsky]

<td width="319" class="texto">Tarjeta de Crédito*</td>
<td width="130">
<select name="TARJETA_CREDITO">
<option value="0"></option>
<option value="Visa">Visa</option>
<option value="Mastercard">Mastercard</option>
</select>
</td>
<td width="141" class="textoder">Número*&l t;/td>
<td width="130">
<input type="text" name="NUMERO_TARJETA">
</td>
</tr>
<tr>
<td width="319" class="texto">Titular*</td>
<td width="130">
<input type="text" name="TITULAR">
</td>
<td width="141" class="textoder">Fecha de Caducidad*</td>
<td width="130">
<input type="text" size="3" name="MES_TARJETA">
<input type="text" size="5" name="ANHO_TARJETA">
</td>
</tr>
<tr>
<td width="319"> </td>
<td width="130"> </td>
<td width="141"> </td>
<td width="130"> </td>
</tr>
<tr>
<td width="319"> </td>
<td width="130"> </td>
<td width="141"> </td>
<td width="130"> </td>
</tr>
<tr>
<td colspan="5">
<div align="center">
<input type="button" name="Submit" value="Enviar" onclick="validar();">
<input type="reset" name="Submit2" value="Borrar">
</div>
</td>
</tr>


....Gracias a quien me pueda ayudar, porque me sacará de un lío bastante gordo.