I am working on a cakePHP project and I need to create a button using PHP that will delete an entry in a database, but I want to display the twitter bootstrap trashcan icon on said button.

The code to include the icon from twitter bootstrap is;

```
<i class="icon-trash"></i>

```

And the PHP code I need it to work in is;

```
<?php echo $this->Form->postLink(__('Delete'), 
    array(
        'action' => 'delete', 
        $skill['Skill']['SkillID']),
        array(
              'class'=>'btn'),
              null, 
              __('Are you sure you want to delete # %s?', 
              $skill['Skill']['SkillID']
));?>

```

Does anyone know how to implement the html in this PHP code so I can replace the text 'Delete' with the icon?