echo product description if the products belongs to specific category

Question

On my category pages I want to display the product description under the product if it belongs to a specific category. This is what I've tried:

<?php
    $catdesc=true;
    $categoryId = $_product->getCategoryId();
    $category = Mage::getModel('catalog/product')->load($categoryId);
    if($category->getCatdesc()==428){
        $catdesc=true;
        break;
}
?>

<?php if($catdesc): ?>
    <span><?php echo $_product->getDescription(); ?></span>
<?php endif; ?>

It get's the product description alright, however for any product- whether it belongs to the specific category or not. Any ideas what I'm doing wrong?

Answer 1

<?php
    $catdesc=false;
    $_product = Mage::getModel('catalog/product')->load($productId);
    if(in_array(428, $_product->getCategoryIds()))
    {
        $catdesc=true;
        break;
    }
?>

<?php if($catdesc): ?>
    <span><?php echo $_product->getDescription(); ?></span>
<?php endif; ?>

Answer 2

<?php $_product = Mage::getModel('catalog/product')->load($productId); ?>

<?php if(in_array(428, $_product->getCategoryIds())): ?>
    <span><?php echo $_product->getDescription(); ?></span>
<?php endif; ?>

Answer 3

You can do the job with this two line:

<?php
if(in_array(428, $_product->getCategoryIds())){
    echo "<span>" . $_product->getDescription() . "</span>";
}
?>

Probably the code of the other guys does not work because they have redeclared $ _product.