Get Order Increment Id in Magento

Question

I\'m trying to get the Order Increment Id in Magento, on the success.phtml page so that I can use this for affiliate tracking.

I\'m using the following code, but it

Answer 1

I had to use...

$_order = Mage::getModel('sales/order')->loadByIncrementId($this->getOrderId());

While in the success.phtml template. Instead of load() I used loadByIncrementId - then my order object was no longer empty.