$a = $_SESSION['id'];
  $ob = Mage::getModel('management/file')->getCollection();
        $res = $ob->addFieldToFilter('task_id',$a);
    //  $res = $ob->addFieldToFilter('comment_id',$id);
        //$img = "";
        foreach($res as $val)
        {
            $img = $val->getFile();
            //$name = $val->getfilename();
            $Type = $val->getType();
            $type = "Content-type: ".$Type;
            header($type);
            print_r($img);
        }

<img height="30px" width="30px" src="imgs.php?Id=<?php print_r($id);?>"/>

$targetDir = Mage::getBaseDir('media') . DS . 'plupload' ;
   if (!file_exists($targetDir)) {
        @mkdir($targetDir);
    }

    if (isset($_REQUEST["name"])) {
    $fileName = $_REQUEST["name"];
    } elseif (!empty($_FILES)) {
    $fileName = $_FILES["file"]["name"];
    } else {
    $fileName = uniqid("file_");
    }
    $filePath = $targetDir . DS . $fileName;

<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA).'your_custom_module/images/'.$val->getFile() ?>"

$datas = Mage::getModel('management/file')->getCollection();

foreach($datas as $data)
{
    Mage::log($data->getFile().'');//log this to find the location where you save file
}

$ob = Mage::getModel('management/file')->getCollection();
$res = $ob->addFieldToFilter('task_id',$a);
foreach($res as $val)
{
     <img src="<?php echo Mage::getBaseUrl()."media/plupload/".$val->getFilename(); ?>" />
}