how to get my cart total items in header in magento

<a href="<?php echo $this->getUrl('checkout/cart/') ?>"> Cart: <span>
<?php if(Mage::getSingleton('checkout/session')->getQuote()->getItemsSummaryQty() > 0)
{ ?>
<?php  echo  __(Mage::getSingleton('checkout/session')->getQuote()->getItemsSummaryQty()) ?>
<?php  } else { ?>
  0
<?php } ?>