[fw-mvc] access url view helper from my custom view helper

Hi I have got a simple view helper which is sitting inside views/helpers
directory that generates a list of links

class Zend_View_Helper_Catmenu
{
public function Catmenu($cats)
{
$catMenu='';

foreach ($cats as $cat)
{
$catMenu .= "<li> \"<b /cats/index/cat/$cat[cat_url]\">$cat[cat] </li>";
}

return $catMenu;
}

}

I would like to use the url helper which is in this case "echo
$this->url(array('controller'=>'cats', 'action'=>'index',
'cat'=>$cat[cat_url]));" for the highlighted code above. As I am not in the
view i won't be able to access the url helper.

Any other way to access a helper inside my custom helper, like in this
example
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