magento cookies not working

I'm using

$id = 'WelcomeWindow';
$data = '1';
$time = time()+60*60*24*30;
Mage::getModel('core/cookie')-&开发者_JAVA百科gt;set($id, $data, $time);

And to get the cookie back

$data_from_cookie = Mage::getModel('core/cookie')->get('WelcomeWindow');

This kind of works but - when getting the cookie it doesn't show the value untill I refersh the Magento Cache within the admin area, is there a way around this?

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I've sorted it, for some reason I've moved the code to be executed before anything else is delivered to the page, so I placed it at the top of head.phtml and it seems to work fine.