How to get cart items total in header.phtml

<?php $cartQty = $this->getSummaryCount() ?>
    <?php if ($cartQty>0): ?>

            <?php if ($cartQty==1): ?>
                <?php echo $this->__('<a class="cartgo" href="%s">(1 ITEM)</a>', $this->getUrl('checkout/cart')) ?>
            <?php else: ?>
                <?php echo $this->__('<a class="cartgo" href="%s">(%s ITEMS)</a>', $this->getUrl('checkout/cart')) ?>
            <?php endif ?>


    <?php endif ?>