Functions in View could not able to load Helpers?

Hi,
I have a little function in one of my views. This function could not
able to use helpers. For example:

//add.ctp

// some html
<?php
function printCat(){

echo '<h1>'.$html->link[$catName,
array('controller'=>'categories','action'=>'view','id'=>$catId)).'</
h1>';

}
?>

I don't know how could I able to make the html helper accessible by
the function?!

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