JQgrid upload image in CI

[eluser]amina[/eluser]
Hi, I'm using Jqgrid CRUD 1.1.
I need upload image in JQgrid but I don´t Know.
How I can implement?
And I don´t Know upload images/file using the function do upload of CI

Till now appears the file but without function in my controller:

Code:

$grid->addField('imagen');
  $grid->label('imagen');
  $grid->params(array(
                            'width'  => 300,                            
                            'editable'  => 'true',
                            'edittype'  => "'file'",
                            'editoptions' => '{enctype: "multipart/form-data"
                             }',
                            'width' => 210,                            
                            'search' => 'false'
                            )
                    );

From already thank you very much.
Regards