How To Remove Please Select From Custom Option Drop Down In Magento

Open: \app\code\core\Mage\Catalog\Block\Product\View\Options\Type\Select.php Alter the following lines:             if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_DROP_DOWN) {             $select->setName('options['.$_option->getid().']')                 ->addOption('', $this->__('-- Please Select --'));         }

To:

            if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_DROP_DOWN) {
            $select->setName('options['.$_option->getid().']');
          //      ->addOption('', $this->__('-- Please Select --'))
        }

Summary of changes: I commented out the ->addOption line with two 
forward slashes AND - and this is important - I moved the semi-colon 
from the end of that line to the end of the previous line.  Reversing 
this change allows you to undo the changes you made.