<div id="agreement-content-<?php echo $_a->getId()?>" class="agreement-content"...

<a href="#agreement-content-<?php echo $_a->getId()?>" class="lightwindow" params="lightwindow_width=800,lightwindow_height=600"><?php echo $this->__('Link') ?></a>)

<?php
/**
 * @see Mage_Checkout_Block_Agreements
 */
?>

<?php if (!$this->getAgreements()) return; ?>
<form action="" id="checkout-agreements" onsubmit="return false;">
<ol class="checkout-agreements">
<?php foreach ($this->getAgreements() as $_a): ?>
    <li>
        <div id="agreement-content-<?php echo $_a->getId()?>" class="agreement-content"<?php echo ($_a->getContentHeight() ? ' style="height:' . $_a->getContentHeight() . '"' : '')?>>
            <?php if ($_a->getIsHtml()):?>
                <?php echo $_a->getContent() ?>
            <?php else:?>
                <?php echo nl2br($this->htmlEscape($_a->getContent())) ?>
            <?php endif; ?>
        </div>
        <p class="agree">
            <input type="checkbox" id="agreement-<?php echo $_a->getId()?>" name="agreement[<?php echo $_a->getId()?>]" value="1" title="<?php echo $this->htmlEscape($_a->getCheckboxText()) ?>" class="checkbox" />
            <label for="agreement-<?php echo $_a->getId()?>"><?php echo $this->htmlEscape($_a->getCheckboxText()) ?> (<a href="#agreement-content-<?php echo $_a->getId()?>" class="lightwindow" params="lightwindow_width=800,lightwindow_height=600"><?php echo $this->__('Link') ?></a>)</label>
        </p>
    </li>
<?php endforeach ?>
</ol>
</form>

• Herunterladen der Dateien unter http://www.p51labs.com/lightwindow/#download
• Entpacken der Dateien:
  • lightwindow.js unter js/ im Template-Verzeichnis (Skin-Bereich)
  • lightwindow.css unter css/
  • alle Grafiken unter images/
• Da JavaScript Links mit kompletter Pfadangabe zum Anzeigen der Grafiken benötigt (zum Beispiel für die "loading"-Grafik), muss dieser noch in die JavaScript-Datei eingebracht werden. Eine mögliche Lösung:
  • Setzen einer Konstante in der Template-Datei page/html/head.phtml oder im Bereich "Diverse Skripte & Skriptverknüpfungen" in der Konfiguration:

<script type="text/javascript">
//<![CDATA[
    var SKIN_URL = '<?php echo $this->getSkinUrl() ?>';
//]]>
</script>

• • Ersetzen aller Vorkommnisse von "images/" in der lightwindow.js durch folgenden Part:

'+SKIN_URL+'images/

• Einbinden der Dateien per layout/page.xml (oder eigene XML-Datei)

<action method="addItem"><type>skin_js</type><name>js/lightwindow.js</name><params/></action>
<action method="addCss"><stylesheet>css/lightwindow.css</stylesheet></action>

• Anschließend kann man alle Funktionen von LightWindow nutzen. Und das sind einige...

/**
 * Add product to shopping cart (quote); if qty > 1 create x items
 *
 * @param   int $productId
 * @param   int $qty
 * @return  Mage_Checkout_Model_Cart
 */
public function addProduct($product, $info=null)
{

    $product = $this->_getProduct($product);
    $request = $this->_getProductRequest($info);


    if ($product->getId()) {

        // store original quantity and set request quantity to 1 so each item line just contains 1 product        
        $qty = max(1, $request->getQty());
        $request->setQty(1);

        // add as many item lines as products should be added
        for ($i = 1; $i <= $qty; $i++) {
        
            $result = $this->getQuote()->addProduct($product, $request);

            /**
             * String we can get if prepare process has error
             */
            if (is_string($result)) {

                $this->getCheckoutSession()->setRedirectUrl($product->getProductUrl());
                if ($this->getCheckoutSession()->getUseNotice() === null) {
                    $this->getCheckoutSession()->setUseNotice(true);
                }
                Mage::throwException($result);
            }
        }
    }
    else {
        Mage::throwException(Mage::helper('checkout')->__('Product does not exist'));
    }

    Mage::dispatchEvent('checkout_cart_product_add_after', array('quote_item'=>$result, 'product'=>$product));
    $this->getCheckoutSession()->setLastAddedProductId($product->getId());
    return $this;
}

/**
 * Declare quote item quantity; duplicate items if qty > 1
 *
 * @param float $qty
 * @return Mage_Sales_Model_Quote_Item
 */
public function setQty($qty)
{

    $qty    = $this->_prepareQty($qty);

    if ($qty > 1) {
    
        $this->setData('qty', 1);
    
        for ($i = 1; $i < $qty; $i++) {
        
            $newItem = clone $this;
            $this->getQuote()->addItem($newItem);
        }
    
    } else {
    
        $this->setData('qty', $qty);
    }

    return $this;
}

protected function copyOrder($baseOrder) {
    if ($quote = $this->prepareOrder($baseOrder)) {

        $service = Mage::getModel('sales/service_quote', $quote);
        $order = $service->submit();
        $order->sendNewOrderEmail();

        return $order;
    }
}

protected function prepareOrder($baseOrder) {

    // create quote
    $quote=Mage::getModel('sales/quote');

    // assign customer
    $customer=Mage::getModel('customer/customer')->load($baseOrder->getCustomerId());
    $storeId=$customer->getStoreId();
    $quote->assignCustomer($customer); //sets ship/bill address

    // add billing address
    $quoteBillingAddress = Mage::getModel('sales/quote_address')->importOrderAddress($baseOrder->getBillingAddress());
    $quote->setBillingAddress($quoteBillingAddress);

    // add shipping address
    $quoteShippingAddress = Mage::getModel('sales/quote_address')->importOrderAddress($baseOrder->getShippingAddress());
    $quote->setShippingAddress($quoteShippingAddress);

    // define store
    $store=$quote->getStore()->load($storeId);
    $quote->setStore($store);

    // add products
    foreach($baseOrder->getAllItems() as $baseOrderItem) {

        if ($baseOrderItem->getParentItem()) continue;

        $product = Mage::getModel('catalog/product')->load($baseOrderItem->getProductId());
        $productOptions = $baseOrderItem->getProductOptions();

        $request = array('qty' => $baseOrderItem->getOrderedQty());

        // manage configurable products
        if (isset($productOptions['info_buyRequest']['super_attribute'])) {

            foreach($productOptions['info_buyRequest']['super_attribute'] as $attributeKey => $attributeValue) {

                $request['super_attribute'][$attributeKey] = $attributeValue;
            }
        }
        try {

            $quote->addProduct($product, new Varien_Object($request));
        }
        catch (Exception $e) {

            // TODO: send notification mail
            return false;
        }
    }

    // set shipping method
    $quote->getShippingAddress()->setShippingMethod($baseOrder->getShippingMethod());
    $quote->getShippingAddress()->setCollectShippingRates(true)->save();

    // set payment method
    $quote->getPayment()->addData($baseOrder->getPayment()->getData());

    // calculate totals
    $quote->collectTotals();

    $quote->save();
    return $quote;
}