Nextgen TinyMce image description field doesn’t format HTML probably when outputing on website

I installed http://wordpress.org/plugins/nextgen-tinymce-description

I input the following test content in NextGen Image Description:

“test content html link“

On the webpage it output displays

"test content <a href="http://www.example.com">html link</a>" 

The code for outputting the description is

<?php echo $image->description ?>

How do make it outputting correctly like what has been input in the Image Description with tinyMCE installed?

Thanks in advance.