select option activado.....ayuda

[Ariel1986]

JavierB probe tu codigo pero no me sirve..... lo que pasa es que los datos de los demas select option tambien me los guarda en la base de datos.... te dejo el codigo de los select option .....

<input type="radio" name="rad" onClick="activar('marcapc','discopc','memoriapc',' tarvideopc','tarsonidopc','tarredpc')"/>
<font face='arial' face='2' color='#026CB4'><b>Computador </b></font>
<input type="radio" name="rad" onClick="activar('marcaimp','modeloimp')" />
<font face='arial' face='2' color='#026CB4'><b>Impresora </b></font>
<input type="radio" name="rad" onClick="activar('red1')" />
<font face='arial' face='2' color='#026CB4'><b>Red</b></font> </p>
<tr>
<p align="center">&nbsp;</p>
<table width="75%" border="0" align="center">
<tr>
<td width="262" height="28" valign="top"><font face='arial' face='2' color='#026CB4'><b>Marca:</b></font>
<select name="marcapc" style="display:none disabled">
<option>AMD</option>Marca
<option>Packard Bell</option>
<option>Olidata</option>
<option>Intel</option>
</select></td>
<td width="156" valign="top"><font face='arial' face='2' color='#026CB4'><b>Marca: </b></font>
<select name="marcaimp" onChange="cambiar()" style="display:none">
<option value="brother" selected>Brother</option>
<option value="canon">Canon</option>
<option value="hp">HP</option>
<option value="epson">Epson</option>
</select></td>
<td width="148" valign="top"><font face='arial' face='2' color='#026CB4'><b>Tipo: </b></font>
<select name="red1" size="1" style="display:none">
<option>Electrica</option>
<option>Telefonica</option>
<option>Datos</option>
</select></td>
</tr>
<tr>
<td height="28" valign="top"><font face='arial' face='2' color='#026CB4'><b>Disco: </b></font>
<select name="discopc" style="display:none">
<option>10 GB</option>
<option>15 GB</option>
<option>20 GB</option>
<option>30 GB</option>
<option>40 GB</option>
<option>60 GB</option>
<option>80 GB</option>
<option>120 GB</option>
<option>mas... GB</option>
</select></td>
<td valign="top"><font face='arial' face='2' color='#026CB4'><b>Modelo: </b></font>
<select name="modeloimp" style="display:none">
<option value="HL-1230" selected>HL-1230</option>
<option value="HL-1240">HL-1240</option>
<option value="HL-1250">HL-1250</option>
</select></td>
<td valign="top"></td>
</tr>
<tr>
<td height="31" valign="top"><font face='arial' face='2' color='#026CB4'><b>Memoria Ram: </b></font>
<select name="memoriapc" style="display:none">
<option>64 Mb</option>
<option>128 Mb</option>
<option>256 Mb</option>
<option>512 Mb</option>
<option>1 GB</option>
</select></td>
<td valign="top"></td>
<td valign="top"></td>
</tr>
<tr>
<td height="28" valign="top"><font face='arial' face='2' color='#026CB4'><b>Tarjeta de Video: </b></font>
<select name="tarvideopc" style="display:none">
<option>Integrada</option>
<option>si</option>
<option>no</option>
</select></td>
<td valign="top"></td>
<td valign="top"></td>
</tr>
<tr>
<td height="28" valign="top"><font face='arial' face='2' color='#026CB4'><b>Tarjeta de Sonido: </b></font>
<select name="tarsonidopc" style="display:none">
<option>Integrada</option>
<option>Si</option>
<option>No</option>
</select></td>
<td valign="top"></td>
<td valign="top"></td>
</tr>
<tr>
<td height="28" valign="top"><font face='arial' face='2' color='#026CB4'><b>Tarjeta de Red: </b></font>
<select name="tarredpc" style="display:none">
<option>Integrada</option>
<option>Si</option>
<option>No</option>
</select></td>
<td valign="top"></td>
<td valign="top"></td>
</tr>
</table>