Problema con Formulario en PHP

[The Neurochild]

parte 3 (no sabía que era muy... muy largo):

Código:

          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Pa&iacute;s:</span></td>
            <td bordercolor="#000000"><select name="pais" id="pais">
              <option value="0" selected="selected">Seleccione pa&iacute;s...</option>
              <option value="Argentina">Argentina</option>
              <option value="Bolivia">Bolivia</option>
              <option value="Brasil">Brasil</option>
              <option value="Canad&aacute;">Canad&aacute;</option>
              <option value="Chile">Chile</option>
              <option value="Colombia">Colombia</option>
              <option value="Costa Rica">Costa Rica</option>
              <option value="Cuba">Cuba</option>
              <option value="Ecuador">Ecuador</option>
              <option value="El Salvador">El Salvador</option>
              <option value="Espa&ntilde;a">Espa&ntilde;a</option>
              <option value="Estados Unidos">Estados Unidos</option>
              <option value="Guatemala">Guatemala</option>
              <option value="Guyana">Guyana</option>
              <option value="Hait&iacute;">Hait&iacute;</option>
              <option value="Honduras">Honduras</option>
              <option value="Israel">Israel</option>
              <option value="M&eacute;xico">M&eacute;xico</option>
              <option value="Nicaragua">Nicaragua</option>
              <option value="Panam&aacute;">Panam&aacute;</option>
              <option value="Paraguay">Paraguay</option>
              <option value="Per&uacute;">Per&uacute;</option>
              <option value="Rep. Dominicana">Rep. Dominicana</option>
              <option value="Surinam">Surinam</option>
              <option value="Uruguay">Uruguay</option>
              <option value="Venezuela">Venezuela</option>
              </select></td>
          </tr>
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Codigo postal: </span></td>
            <td bordercolor="#000000"><input name="zip" type="text" id="zip" size="5" maxlength="5" /></td>
          </tr>
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Estado/Departamento/Provincia:</span></td>
            <td bordercolor="#000000"><input name="estado" type="text" id="estado" /></td>
          </tr>
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Ciudad:</span></td>
            <td bordercolor="#000000"><input name="ciudad" type="text" id="ciudad" /></td>
          </tr>
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Contrase&ntilde;a</span></td>
            <td bordercolor="#000000"><input name="contrasena" type="password" id="contrasena" value="" /></td>
          </tr>
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Reescriba su contrase&ntilde;a: </span></td>
            <td bordercolor="#000000"><input name="confirmar" type="password" id="confirmar" /></td>
          </tr>
 
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7">Metodo de pago:</span></td>
            <td bordercolor="#000000"><p>
              <input name="payment" type="radio" value="MasterCard" />
              <img src="images/mastercard.gif" width="100" height="62" />
              <input name="payment" type="radio" value="Visa" />
              <img src="images/visa.gif" width="100" height="62" /> <br />
              <input name="payment" type="radio" value="AMEX" />
              <img src="images/amex.jpg" width="74" height="100" /></p>
            <p><span class="Estilo7">N&uacute;mero de Tarjeta:</span><br />
              <input name="numtarjeta" type="text" id="numtarjeta" size="16" maxlength="16" />
            </p>
            <p><span class="Estilo7">Fecha de vencimiento:</span><br />
 
                <select name="month" id="month">
                  <option value="0" selected="selected">Mes</option>
                  <option value="1">1</option>
                  <option value="2">2</option>
                  <option value="3">3</option>
                  <option value="4">4</option>
                  <option value="5">5</option>
                  <option value="6">6</option>
                  <option value="7">7</option>
                  <option value="8">8</option>
                  <option value="9">9</option>
                  <option value="10">10</option>
                  <option value="11">11</option>
                  <option value="12">12</option>
                </select>
              / 
              <select name="year" id="year">
                <option value="0" selected="selected">A&ntilde;o</option>
                <option value="2007">07</option>
                <option value="2008">08</option>
                <option value="2009">09</option>
                <option value="2010">10</option>
                <option value="2011">11</option>
                <option value="2012">12</option>
                <option value="2013">13</option>
                <option value="2014">14</option>
                <option value="2015">15</option>
                <option value="2016">16</option>
                <option value="2017">17</option>
                <option value="2018">18</option>
                <option value="2019">19</option>
                <option value="2020">20</option>
                <option value="2021">21</option>
              </select>
</p>
            <p><span class="Estilo7">Codigo de seguridad (Coloque los 3 &uacute;ltimos digitos al reverso de su tarjeta):</span><br />
              <input name="codigo" type="password" id="codigo" size="3" maxlength="3" />
            </p></td>
          </tr>
          <tr>
            <td align="right" bordercolor="#000000"><span class="Estilo7"></span></td>
            <td bordercolor="#000000"><input name="payment" type="radio" value="PayPal" />
            <img src="images/paypal.gif" width="120" height="50" /></td>
          </tr>
 
 
          <tr>
            <td colspan="2" align="right" valign="top" bordercolor="#000000"><input type="submit" name="Submit" value="Enviar" onClick="comprobarFormulario()" />
            <input name="Reset" type="reset" id="Reset" value="Restablecer" /></td>
          </tr>
        </table>
      </form>      </td>
  </tr>
  <tr>
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      <tr>
        <td><p class="Estilo11">&copy; 2007 Equiphone.<br />
          Todos los derechos reservados. </p></td>
      </tr>
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