magento 显示物品所有价格

<?php
    $product= Mage::getModel('catalog/product')->load(product_id);
    $price = $product->getPrice();
    $webprice = $product->getwebprice();
    $specialprice = ($_product->getSpecialPrice());
    if($specialprice==$price)
    {?>
    <span class="price">Price $<?php echo number_format($price,2);?></span>
    <?php } else { ?>
    <div class="regular-price">
    <span>Regular Price:</span>
    <span class="price">$ <?php echo number_format($price,2); ?></span>
    </div>
    <div class="special-price">
    <span>Web Special:</span>
    <span class="price">$ <?php echo number_format($specialprice,2); ?> </span>
    </div>
<?php } ?>