file custom option field
$productIdtoadd=13;
$qty=1;
3:file option Id
$image = "logaao.jpg";
echo Mage::getBaseDir() . $image;
$carturl = $baseUrl."checkout/cart/";
$cart = Mage::getSingleton('checkout/cart');
$cart->addProduct($productIdtoadd, array(
'qty' => $qty,
//'super_attribute' => array($attributeid =>$assproductColorOptionId),
'options' =>array( 3 => array(
'quote_path' => Mage::getBaseDir() . $image,
'secret_key' => substr(md5(file_get_contents(Mage::getBaseDir() . $image)), 0, 20)),
)
)
);
$cart->save();