el formulario es este:
<form name="nuevo_empleado" action="" onsubmit="enviarDatosEmpleado(); return false">
<input name="idalimento" type="hidden" value="<?php echo $idali; ?>" />
<input name="idreceta" type="hidden" value="<?php echo $idrec; ?>" />
<table width="730" border="0">
<tr>
<td WIDTH="166">Nombre_alimento</td>
<td width="462"><input disabled="disabled" name="nombre" type="text" value="<?php echo $nom; ?>" size="70" /></td>
</tr>
<tr>
<td WIDTH="166">Racion_comestible</td>
<td><input disabled="disabled" name="racion" type="text" value="<?php echo $rac; ?>" /></td>
</tr>
<tr>
<td WIDTH="166">Comestible_alimento</td>
<td><input disabled="disabled" name="comestible" type="text" value="<?php echo $com; ?>" /></td>
</tr>
<tr>
<td WIDTH="166">Grupo_alimento</td>
<td><input disabled="disabled" name="grupo" type="text" value="<?php echo $ngrup; ?>" /></td>
</tr>
</tr>
<tr>
<td WIDTH="166">Subgrupo Alimento</td>
<td><input disabled="disabled" name="subgrupo" type="text" value="<?php echo $nsubg; ?>" /></td>
</tr>
<tr>
<td WIDTH="166">Unidad_medida</td>
<td><input disabled="disabled" name="unidad" type="text" value="<?php echo $nunid; ?>" /></td>
</tr>
</table>
<p>
<input type="submit" name="Submit" value="Insertar" />
</p>
</form>