Drupal: Imagecache presets in templates

<pre>    
<?php if ($account->picture) {
        print theme('imagecache', 'profile_pic', $account->picture, $alt, $title, $attributes);
      }
      else {
        print theme('imagecache', 'profile_pic', default_profile_pic.png, $alt, $title, $attributes);
      }
      ?>
</pre>
 
//or this
function theme_profile($image_path) {
if (!$image_path) {
$image_path = [path_to_default_image]
}
return theme('imagecache', $preset_name, $image_path);
}