Magento 1.9 - Displaying Configurable product image in Order History page

I am displaying a image of ordered products in "My Order" in user dashboard.

<?php
        $orderId = $_order->getId(); 
        $order = Mage::getModel('sales/order')->load($orderId);
        $items = $order->getAllItems();
        foreach ($items as $itemId => $_item)
          {
            if($_item->getProductType() == 'configurable') 
                {
                  $product = $_item->getProduct();
                 }else{
                  $product = Mage::getModel('catalog/product')->setStoreId($_item->getOrder()->getStoreId())->load($_item->getProductId());
                }
?>
               <img src="<?php echo Mage::helper('catalog/image')->init($product, 'small_image')->resize(75); ?>" width="75" height="75" />
<?php }?>

All works fine. but it display all images of configurable products. i want to display the selected configurable simple product image.

Any help will highly appreciated

i used getAllVisibleItems instead of getAllItems and Now it is working.

<?php
$orderId = $_order->getId(); 
$order = Mage::getModel('sales/order')->load($orderId);
$items = $order->getAllVisibleItems();
foreach ($items as $itemId => $_item){
  if($_item->getProductType() == 'configurable'){
          $product = $_item->getProduct();
  }else{
          $product = Mage::getModel('catalog/product')->setStoreId($_item->getOrder()->getStoreId())->load($_item->getProductId());
  }?>
       <img src="<?php echo Mage::helper('catalog/image')->init($product, 'small_image')->resize(75); ?>" width="75" height="75" />
 <?php }?>