Upload Files In Another Domain On Smae Server

I need to move all uploaded files in domain , and all website will be in another domain
but in same server ip , so how to edit uploading process to upload files directly to " Files domain " ? .

EX:

Site Domain : doamin.com

Files domain : myfiles.com

in normal way this my code :
View
.

..........
    <?php
 $form=$this->beginWidget('CActiveForm', array(
        'id'=>'Cfiles-form',

            'enableAjaxValidation'=>false,
            'enableClientValidation'=>true,
            'clientOptions'=>array('validateOnSubmit'=>true), //This is very important


       	'htmlOptions' => array('enctype' => 'multipart/form-data'),
    )); ?>
        <div class="row">
            <?php echo $form->labelEx($model,'file'); ?>
            <?php echo $form->fileField($model,'file'); ?>
            الملفات المسموحة : jpg,gif, png,pdf,rar,zip,doc,docx
            <?php echo $form->error($model,'file'); ?>
        </div>
    ...............

Controller

public function actionCreate()
    {

   	..................
.

        // Uncomment the following line if AJAX validation is needed
        $this->performAjaxValidation($model);

        if(isset($_POST['Cfiles']))
        {



            $model->attributes=$_POST['Cfiles'];
            $valdiate=$model->validate();


     	/////// upload image functions 

     	$rnd = rand(0,999984375);  // generate random number between 0-9999
     	$model->attributes=$_POST['Cfiles']['file'];


            $uploadedFile=CUploadedFile::getInstance($model,'file');
        if(!empty($uploadedFile)){
            $ext=$uploadedFile->getExtensionName();
            $fileName = "isa$rnd.{$ext}";  // random number + file name
            }


         	////////// end 

Thanks in advance