como puedo pasa este dato por el post

[a83]

mira te explico :

tengo este formulario en el cual hay unos combo box que se trabajan por funciones la funcion me carga el combo bos como todos ya asabesmos pero ahora yo no rencuerdo como tomar eso datos para enviarlos a guardar le dejo el cod

Código PHP:

 <form id="form1" name="form1" method="post" action="">
  <p>&nbsp;</p>
  <table width="612" border="0" align="center" cellpadding="0" cellspacing="0" class="oSuperior">
    <!--DWLayoutTable-->
    <tr>
      <td width="1" height="15"></td>
      <td width="1"></td>
      <td width="68"></td>
      <td width="13"></td>
      <td width="16"></td>
      <td width="136"></td>
      <td width="16"></td>
      <td width="83"></td>
      <td width="71"></td>
      <td width="16"></td>
      <td width="82"></td>
      <td width="9"></td>
      <td width="17"></td>
      <td width="43" rowspan="2" valign="top"><img src="../iconos/iconos-linux-acciones/mail_send.png" width="32" height="32" /></td>
      <td colspan="2" rowspan="2" valign="top"><img src="../iconos/iconos-linux-acciones/project_open.png" width="32" height="32" /></td>
    </tr>
    <tr>
      <td height="38"></td>
      <td></td>
      <td colspan="3" rowspan="3" valign="top"><img src="../iconos/logo siap amarillo web.jpg" width="97" height="80" /></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    
    
    
    
    
    
    
    
    
    <tr>
      <td height="35"></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td valign="top">Numero Guia
        <label for="textfield"></label>
        <input name="Nguia" type="text" id="Nguia" size="11" /></td>
      <td></td>
      <td valign="top">Fecha Ingreso
      <input name="desde" type="text" id="desde" onclick="popUpCalendar(this, form1.desde, 'dd-mm-yyyy');" size="10" /></td>
      <td>&nbsp;</td>
      <td></td>
      <td></td>
      <td width="6"></td>
      <td width="34"></td>
    </tr>
    
    <tr>
      <td height="7"></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td height="14"></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    
    <tr>
      <td height="13"></td>
      <td colspan="2" rowspan="2" valign="top"><label for="textfield">Clientes</label>        <?php generaPaises(); ?></td>
      <td></td>
      <td colspan="2" valign="baseline"><label for="label">Producto</label></td>
      <td></td>
      <td colspan="2" valign="top">Medidas</td>
      <td></td>
      <td rowspan="2" valign="top"><label for="textfield">Unidades</label>
        <input name="unidad" type="text" id="unidad" size="10" /></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td height="22"></td>
      <td>&nbsp;</td>
      <td colspan="2" valign="top"><label for="textfield"></label>        <select disabled="disabled" name="estados" id="estados">
          <option value="0">Selecciona opci&oacute;n...</option>
                                  </select></td>
      <td>&nbsp;</td>
      <td colspan="2" valign="top"><label for="textfield"></label>        <select disabled="disabled" name="medidas" id="medidas">
          <option value="0">Selecciona opci&oacute;n...</option>
                                  </select></td>
    <td>&nbsp;</td>
      <td>&nbsp;</td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    
    <tr>
      <td height="52"></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td>&nbsp;</td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td height="51"></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td></td>
      <td colspan="3" valign="top" class="button3"><label for="Submit"></label>
        <input name="Submit" type="submit" class="oBoton" id="Submit" value="Enviar" /></td>
    <td>&nbsp;</td>
    </tr>
  </table>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
</form>