how can i set a value from the Master into the detail grid whet adding a new record.
im triyinf with this but this does not work:

$col["title"] = "No_GUIA"; // caption of column
$col["name"] = "No_GUIA"; // field name, must be exactly same as with SQL prefix or db field
$col["editoptions"] = array("defaultValue" => $_GET["No_GUIA"]);
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the rest of the code:
// refresh detail grid on master edit
$opt["edit_options"]["afterSubmit"] = "function(){ jQuery('#list2').trigger('reloadGrid', [{current:true}]); return [true,'']; jQuery('#list1').setSelection(jQuery('#list1').jqGrid('getGridParam','selrow')); }";

// select after add
$opt["add_options"]["afterComplete"] = "function (response, postdata) { r = JSON.parse(response.responseText); $('#list1').setSelection(r.id); }";

// extra params passed to detail grid, column name comma separated
$opt["subgridparams"] = "ID,No_GUIA";
$opt["multiselect"] = false;
$opt["export"] = array("filename"=>"my-file", "sheetname"=>"test", "format"=>"pdf");
$opt["export"]["range"] = "filtered";

$opt["sortname"] = 'FECHA_DE_VENCIMIENTO';
$opt["sortorder"] = "asc";
$grid->set_options($opt);
$grid->table = "guias_retrasadas";

$out_master = $grid->render("list1");

// detail grid
$grid = new jqgrid($db_conf);

// receive id, selected row of parent grid
$id = intval($_GET["rowid"]);
$No_GUIA = $_GET["No_GUIA"];
// for non-int fields as PK
// $id = (empty($_GET["rowid"])?0:$_GET["rowid"]);

$opt = array();
$opt["sortname"] = 'id'; // by default sort grid by this field
$opt["sortorder"] = "desc"; // ASC or DESC
$opt["datatype"] = "local"; // stop loading detail grid at start
$opt["height"] = ""; // autofit height of subgrid
$opt["caption"] = "Seguimiento"; // caption of grid
$opt["multiselect"] = true; // allow you to multi-select through checkboxes
$opt["reloadedit"] = true; // reload after inline edit
$opt["export"] = array("filename"=>"my-file", "sheetname"=>"test", "format"=>"pdf", "range"=>"filtered"); // export to excel parameters

// Check if master record is selected before detail addition
$opt["add_options"]["beforeInitData"] = "function(formid){ var selr = jQuery('#list1').jqGrid('getGridParam','selrow'); if (!selr) { alert('Please select master record first'); return false; } }";

// fill detail grid add dialog with master grid id
$opt["add_options"]["afterShowForm"] = 'function() { var selr = jQuery("#list1").jqGrid("getGridParam","selrow"); jQuery("#ID").val( selr ) }';

// reload master after detail update
$opt["onAfterSave"] = "function(){ var selr = jQuery('#list1').jqGrid('getGridParam','selrow'); jQuery('#list1').trigger('reloadGrid',[{jqgrid_page:1}]); setTimeout( function(){jQuery('#list1').setSelection(selr,true);},500 ); }";
$grid->set_options($opt);

// and use in sql for filteration

$grid->select_command = "SELECT ID, No_GUIA, FECHA, COMENTARIOS FROM guias_seguimiento WHERE No_GUIA = '$No_GUIA'";
// this db table will be used for add,edit,delete
$grid->table = "guias_seguimiento";

$col = array();
$col["title"] = "Id"; // caption of column
$col["name"] = "ID"; // field name, must be exactly same as with SQL prefix or db field
$col["width"] = "20";
$col["editable"] = true;
$cols[] = $col;

$col["title"] = "No_GUIA"; // caption of column
$col["name"] = "No_GUIA"; // field name, must be exactly same as with SQL prefix or db field
$col["editoptions"] = array("defaultValue" => $_GET["name"]);

$col["width"] = "20";
$col["editable"] = true;
$cols[] = $col;

$col["title"] = "FECHA"; // caption of column
$col["name"] = "FECHA"; // field name, must be exactly same as with SQL prefix or db field
$col["width"] = "20";
$col["editable"] = true;
$cols[] = $col;

$col["title"] = "COMENTARIOS"; // caption of column
$col["name"] = "COMENTARIOS"; // field name, must be exactly same as with SQL prefix or db field
$col["width"] = "20";
$col["editable"] = true;
$cols[] = $col;

$grid->set_columns($cols);

$grid->set_actions(array(
"add"=>true, // allow/disallow add
"edit"=>true, // allow/disallow edit
"delete"=>true, // allow/disallow delete
"rowactions"=>true, // show/hide row wise edit/del/save option
"autofilter" => true, // show/hide autofilter for search
"search" => "advance" // show single/multi field search condition (e.g. simple or advance)
)
);