way to display a thumbnail image in the admin grid view?

Step 1
======================================
Create Directories (if NOT there)
app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/Grid/
app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/Grid/Renderer/

Step 2
======================================
Create a file named “Image.php” at the following location
app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/Grid/Renderer/


 Step 3
======================================
Paste the following code into “Image.php” created above

class <Mycomapname>_<Mymodule>_Block_Adminhtml_Grid_Renderer_Image extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract
{
    public function render(Varien_Object $row)
    {
        if($row->getData($this->getColumn()->getIndex())==""){
            return "";
        }
        else{
            $html = '<img ';
            $html .= 'id="' . $this->getColumn()->getId() . '" ';
            $html .= 'width="45" ';
            $html .= 'height="35" ';
            $html .= 'src="' . Mage::getBaseUrl("media") . $row->getData($this->getColumn()->getIndex()) . '"';
            $html .= 'class="grid-image ' . $this->getColumn()->getInlineCss() . '"/>';
          
            return $html;
        }
    }

}

Hi All, You do not need to overwrite any thing at all, just follow these simple steps instead Step 1 ====================================== Create Directories (if NOT there) app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/Grid/ app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/Grid/Renderer/ Step 2 ====================================== Create a file named “Image.php” at the following location app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/Grid/Renderer/ Step 3 ====================================== Paste the following code into “Image.php” created above class <Mycomapname>_<Mymodule>_Block_Adminhtml_Grid_Renderer_Image extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract {     public function render(Varien_Object $row)     {         if($row->getData($this->getColumn()->getIndex())==""){             return "";         }         else{             $html = '<img ';             $html .= 'id="' . $this->getColumn()->getId() . '" ';             $html .= 'width="45" ';             $html .= 'height="35" ';             $html .= 'src="' . Mage::getBaseUrl("media") . $row->getData($this->getColumn()->getIndex()) . '"';             $html .= 'class="grid-image ' . $this->getColumn()->getInlineCss() . '"/>';                        return $html;         }     } } Step 4 ====================================== Open app/code/local/<Mycomapname>/<Mymodule>/Block/Adminhtml/<Mymodule>/Grid.php and paste the following code into the function protected function _prepareColumns() some where $this->addColumn('<Tbl_Colname>', array(             'header'    => Mage::helper('<mycomapname>_<mymodule>')->__('Image'),             'align'     => 'left',             'width'     => '100px',             'index'     => '<Tbl_Colname>',             'type'      => 'image',             'escape'    => true,             'sortable'  => false,             'filter'    => false,             'renderer'  => new <Mycomapname>_<Mymodule>_Block_Adminhtml_Grid_Renderer_Image,         )); ===================================================================